The SK Tools 46186 1/2″ Drive Impact Adapter is a must-have tool for mechanics. It allows you to change sockets quickly and easily. The impact adapter is made of heat treated, drop-forged construction for added durability. It features a black oxide finish that resists corrosion and rusting. Designed with 4-point contact technology, the drive size is 1/2″ and the output drive size is 3/4″. When it comes to working on cars, this impact socket adapter will make your life easier.