NordWolf 5-Piece Impact Drive Socket Adaptor, Impact Torsion Magnetic Bit Holder and Impact Torsion Magnetic Quick Change Bit Holder Set with Color Codes NW-21018 1. All tools are made for using on high torque impact driver and wrench 2. Impact adaptors are made of Chrome vanadium steel, superior heat treatment, black Manganese Phosphate finishing for better corrosion resistant, extend lifetime and durability. Spring loaded ball bearing to secure sockets in place, chamfered edges at square drive end for easy fitting into socket. All adaptors are with 1/4" hex shank, convert to square ends for 1/4", 3/8" and 1/2" impact sockets using. 3. Impact bit holders are with torsion zone, helps to absorb the high torque when using on impact drivers. Poweful magnet to hold bits and hardware firmly. Stainless steel tube with superior heat treatment Chrome Vanadium 1/4" hex shank for high torque and long lifetime. The impact bit holder has retain ring to double secure holding bits. 4. Impact magnetic quick release bit holder has black knurled sleeve, push forward to insert and release bits. 5. All impact adaptors and bit holders are with color codes for quick and easy identification, red code for 1/4", yellow code for 3/8" and blue code for 1/2". 6. Set contents: impact drive socket adaptors 1/4" (red code, 2.36" length), 3/8" (yellow, 2.36"), 1/2" (blue, 2.95"), impact torsion magnetic bit holder with retaining ring (red code, 2.36"), impact torsion quick change bit holder (red code, 2.36"). 7. The set comes with handy storage rail ·Made for using on high torque impact driver and wrench