Features: Stainless steel ball lock for a secure fit Sockets snap tightly and won't slip off 1/4 inch Hex handle prevents stripping during high-speed operation Super strong heat-treated chrome vanadium stainless steel for normal leather and impact Use-sandblasted finish Converts drills to high-speed socket drivers Applicable to screwdriver chuck or electric tool screwdriver (hex hole or three jaws chuck can be) Driven bushing is used, can be the original hexagonal side after installation into size to square, which can be used for bushing installation, it is a good addition for conversion Specification: Material: CR-V chrome vanadium steel Color: Black Size: (approx.) 1/4" x 1/4" x 50mm-1/4" shank can be converted to 6.35mm square 3/8" x 1/4" x 50mm-1/4" shank can be converted to 9.53mm 1/2" x 1/4" x 50mm-1/4" shank can be converted to 12.7mm square Quantity: 1 set/3 pcs Note: Please allow 1-3mm error due to manual measurement. Pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 3pcs x Hex Head Bits