Impact sockets are made of chrome vanadium steel. These socket adapters each have improved hardness, a rust and rust resistant die-cast body, each with a ball bearing. Simple to use screwdrivers, perfect handy tool for hard-to-reach corners and tight spaces, maximum torque 77N.m. This adapter set is designed to provide a securely locked extension to your existing tool. The socket adapter set includes 3 pieces of 1/4" - 65mm, 3/8" - 65mm and 1/2" - 73mm. Suitable for screwdriver or power drill or screwdriver handle tools, with hexagonal holes or three-jaw chuck, they can be connected to the drill, rechargeable drill or manual wrench, extending their reach to inaccessible stenosis, bent screws, nut and more. Suitable for screwdriver or power drill or screwdriver handle tools, with hexagonal holes or three-jaw chuck, they can be connected to the drill, rechargeable drill or manual wrench, extending their reach to inaccessible stenosis, bent screws, nut and more.