Product Name: 6Pcs Socket Wrench 1/4", 1/2", 3/8", 3/4" Ratchet Breaker Drive Spanner Set with Pneumatic Sleeve Adapter Wrench Hand Tool Set Features: - Chrome vanadium steel forging, gears, and jaw hardening heat treatment, hard wear-resistant. - 100% brand new and easy to use. The arc inner corner of the conversion sleeve is designed with bolt holes, which has strong locking force and is not easy to slip. - Adopting a four-corner arc square head design, this impact sleeve converter kit has a ball bearing to ensure a firm fixation. - The sleeve adapter is made of chromium-vanadium alloy steel, forged as a whole, and the surface is black phosphating. The whole is quenched. Specifications: - Name: Sleeve Adapter - Surface Treatment: Black phosphating - Material: Chrome-vanadium alloy steel - Application: Suitable for use in auto repair shops, 4S shops, CNC machine tools, construction sites, and most pneumatic scenes and power tools. - Weight: - 3/8" hole 1/4" head: about 18g - 1/4" hole 3/8" head: about 18g - 3/8" hole 1/2" head: about 43g - 1/2" hole 3/8" head: about 47g - 3/4" hole 2/1" head: about 253g - 1/2" hole 3/4" head: about 136gPacking List: - Sleeve x6 - Toolbox x1