These adapters are made of steel with black phosphate coating for superior durability and abrasion resistance that will last even the most demanding jobs With advanced torsion zones and heat treatment construction, this adapter set is an essential addition to any toolkit to absorb high-torque impact and increase productivity and efficiency Ideal for automotive repair, furniture assembly and machine maintenance, the bit holder provides efficient operation in a variety of applications The Impacts driver bit holder converts seamlessly and features three adapters that convert a 1/2" square drive to a 1/4" quick release sixteen shank for increased tool versatility Perfect for professional technicians, hobbyists, and repair personnel, this set provides the accuracy and reliability you need to tackle a variety of building projects with ease, Manufacturer: Rxgiasup