[High Quality Chrome Vanadium Steel]:The adapter set is made of heat-treated chromium vanadium steel material, which has high hardness and durability and can withstand the test of different jobs. [ and Recognizable Marking]:Our socket adapter set is made of black manganese phosphate coating, which has excellent resistance and rust resistance so that you can use and preserve it for a long time. [Safe and Secure]:The spring-loaded ball detent can lock your socket in place and secure the through-hole to prevent it from falling, providing excellent stability and execution. A through hole on end securely locks the adapter to tang. [Perfect Complete Set]: The set includes: Reducers: 1 inch F to 3/4 inch M, 3/4 inch F to 1/2 inch M, 1/2 inch F to 3/8 inch M, 3/8 inch F to 1/4 inch M; adapters: 1/4 inch F to 3/8 inch M, 3/8 inch F to 1/2 inch M, 1/2 inch F to 3/4 inch M, 3/4 inch F to 1 inch M. [Wide Applicability]:Complete impact drive socket adapter kit, easy conversion and strong compatibility, can meet all your needs. Designed for screwdrivers, wrenches and ratchets. Can be used with pneumatic tools, electric tools or drive tools. Specifications: 3/8-1/2, 1/2-3/8, 3/4-2/1, 1/4-3/8, 3/8-1/4, 1/2-4/3, 3/4-1, 1-3/4 Note: If there is a layer of oil on the socket of the kit you receive, please rest that this is a normal new kit. It is a specially applied anti-rust oil to protect products. Please use caution. Its purpose is to allow the existing jackhammers or wrenches in our hands to use sockets of specifications that do not match their own square heads (square heads). he label words on the product are random, Cannot be chosen the specific words. The actual product may have slight differences or color differences. Material: Chrome vanadium steel colour: As shown Package Contents: 8 x Impact Socket Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.