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K504 Heavy Duty Manual Impact Driver Set, 3/8-Inch 1/2-Inch, 25-Piece

Free shipping on orders over $29.99

$39.99

$ 17 .99 $17.99

In Stock

About this item

  • Instant impact force loosens rusted, damaged or frozen screws, bolts or fasteners without damaging them
  • Heavy duty impact driver features forward and reverse function for tightening and loosening
  • The enhanced impact and comfortable ergonomic handle with corrosion-resistant black chrome plated finish
  • The set come in a compact, blow-molded case for safe and easy storage
  • Includes 21-piece bits, 2-piece adaprers, a wrench and a impact driver



Product Description

KAIFNT K504 Heavy Duty Manual Impact Driver Set, 3/8-Inch, 25-Piece


K504-2
Dual Direction

When you strike the top of the tool with a hammer, the drive tang is turned in the direction you have set the tool.

L: Rotate Left. Loosening left-handed thread fasteners

R: Rotate Right. Tightening left-handed thread fasteners

Turn simple hammer strikes into a powerful and consistent force to securely Tighten or quickly loosen stubborn nuts and bolts.

  • 4 Pc. PH: #1, #2, #3, #4
  • 4 Pc. Slot: 1/4, 5/16, 3/8, 1/2
  • 5 Pc. Torx: T30, T40, T45, T50, T55
  • 4 Pc. Metric Hex: 5, 6, 8, 10mm
  • 4 Pc. SAE Hex: 7/32, 1/4, 5/16, 3/8"

Heavy Duty Manual Impact Driver

The impact driver set is one useful tool for a professional use. It helps you unfasten the corroded screws, fasteners or frozen bolts with ease. The mechanism behind this is that it converts a hammer strike into a high-torque impact force. This driver set is heavy and strong hence it is freeing even the most stubborn fasteners and can be used anywhere. It can drive the included hex shank screwdriver bits, other universal 5/16-inch hex shank bits, or any 3/8 and 1/2-inch drive impact socket.

  • Heavy duty manual impact driver - 3/8-inch, 1/2-inch drive
  • 21-piece 5/16-inch 30mm S2 steel bits
  • Impact bit holder socket - 3/8-inch drive to 5/16-inch hex insert
  • Impact socket adapter - 3/8-inch drive to 1/2-inch drive
  • Super-thin open end wrench - 3/8"; 1/4, 5/16, 1/2"
  • Storage case
warehouse

A COMPANY OVERVIEW

Our company is located in Taiwan and has been selling tools for more than 20 years. The factory has grown rapidly over the last several years, and employees have the experience, education and training. We value cooperation and quality management between factories.

OUR PRODUCTS

Kaifnt continually strives to bring fresh ideas and new products to its customers. Our products don’t have cheap goods from China and are dressed in frustration-free packaging. As such, customers and consumers don’t have to worry about the the quality and value in our products.

Our mission is to offer our customers products that exceeds their expectations in cost and performance rather than being forced by cost-reduction.


Brenda
August 30, 2025
Noticed right away these Phillips Bits, for the Stator cover were NOT going to come out with a screwdriver on my 2000 Kawasaki Vulcan 750, so after reading many reviews of different brands, I landed on this one. And after 2-3 mild hits with a standard hammer, each of the 3 bolts came loose with ease!! Just this job alone paid for the tool itself in my experience, had these stripped out, and having to deal with drilling them out etc. Very happy with my purchase and know I will be using it again on this bike when I remove the engine. Great Product at a fair price!!
Charles
August 23, 2025
Worked awesome. One of the best purchases I've made lately. The wrench to change it to left was hidden under the form and took a few minutes to see it. You will not be changing it by bare hand. I did break a smaller straight slot bit but that was my fault. No biggie.
Gar M.
July 2, 2025
Seems like a decent tool. Quality looks to be fine. Made in Tiawan, not China. Usually better quality.I like the fact you get a bunch of bits and the blow molded case is nice.Only thing I do not like is the striking head is too small. Easy to miss with a heavy hammer, which would not be good if you hit your hand. Sometimes you have to smack the tool REALLY hard. Some impact drivers have flared heads to make hitting the right spot easier. Are you listening KAIFNT?
JT
June 21, 2025
Simple; works; when you need this you need it now. It's well-priced. Buy this.
Mademeabeliever
June 8, 2025
Never used a tool like this before but with practice and patience it frees stubborn screws or bolts. Great weight and made of steel once you hold this tool you feel the quality. Different bits included and ratchet like switch you chose the direction .
Paul
May 4, 2025
I removed one screw from the pole shoes in a case tractor starter with a snap on bit and impact driver. Bit broke on second screw. Took a chance on this driver, and it didn’t let me down. The other 3 screws left were removed with about 8 blows each with a 2 pound mallet. The 1/2 inch slot bit in the set I used sustained no damage, fit perfect which I think is the answer as the snap on bit was loose and maybe not the one I should have used but was the biggest I had, and looks like new yet. Very happy with the strength as those screws are about as tight as you can get.
chris
April 1, 2025
have used a lot and it works good
CLH86
March 23, 2025
Had a couple of old/worn/stubborn screws on a motorcycle that I needed to remove. They wouldn’t budge and the more I messed with them, the softer and more inclined to strip the screws became.I had never seen or used one of these before, but it looked like the tool for the job, so I bought it.This screwdriver is very solid and easy to use. A few taps on each screw and off they came.Excellent product!
Mohammad
December 16, 2024
Couple stuck bolts , hammered and it unscrewed immediately.. the two adapters are a great addition
Kevin Parente
November 24, 2024
I like the item and had been using it for a year now in a machanic shop. But i just broke a bit the other day and i would like to know if i could get a new one.