<p>Sincereetali</p><p>Material: Steel High carbon steel, high quality material to avoid during use.</p> <p>General Use: These extensions, adapters, and reducers are designed for impact use and feature spring-loaded detent balls to securely lock the sockets, while the through holes on the drive end of the adapters and reducers lock onto the drive shank for convenience, regardless of the tool you choose to use. Ideal for DIY, household maintenance, and most general repairs.</p> <p>High Quality: The extension adapters are made of heat-treated chrome vanadium steel with a black oxide coating. The adapters and reducers are made of premium, high-strength chrome steel with a manganese phosphate coating to help resist rust and corrosion. a lifetime of use.</p> <p>Widely Application: Fits 1/4" quick-change chuck systems or directly into the drill chuck. Any cordless power drill into a nut driver. Convenient for quickly driving nuts, bolts and fasteners, etc. The spring-loaded ball bearing on the head holds the sockets securely.</p> <p>Material: Chrome Vanadium Steel (CR-V)</p> <p>Size:</p> <p>1/4 * 1/4 * 65mm Length ------ 1/4" shank can be converted to 6.35mm square head</p> <p>3/8 * 1/4 * 65mm Length ------ 1/4" shank can be converted to 9.4mm square head</p> <p>1/2 * 1/4 * 72mm Length ------ 1/4" shank can be converted to 12.6mm square head</p>