【Material】High carbon steel, high quality material to avoid during use. 【General Use】These extensions, adapters, and reducers are designed for impact use and feature spring-loaded detent balls to lock sockets securely, while the through holes on the drive end of the adapters and reducers lock onto the drive shank. convenience, regardless of the tool you have chosen to use. Ideal for DIY, household maintenance, and most general repairs. 【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. 【Widely Application】Suitable for 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. Spring-loaded ball bearing on the head holds sockets securely. Color:Black Feature: 1. Color-coded for easy recognition. 2. Spring-loaded ball for secure grip retention, so sockets snap in tightly and won't slip. 3. 1/4" hex shank prevents stripping during high-speed drilling operation. 4. Extra strong heat-treated chrome vanadium steel for normal and impact use 5.Adapts sockets to drills and drivers, transforms any electric or cordless drill into a nut driver. 6. Converts all power drills into speed socket drivers. 7. Use with hand screwdriver handles or battery or power tool. Material: Chrome Vanadium Steel (CR-V) Size: 1/4 * 1/4 * 65mm Length ------ 1/4" shank can be converted to 6.35mm square head 3/8 * 1/4 * 65mm Length ------ 1/4" shank can be converted to 9.4mm square head 1/2 * 1/4 * 72mm Length ------ 1/4" shank can be converted to 12.6mm square head 4pcs Adapter Set Size: 1/2"------ female square converted to 3/8" male 3/8"------ square female converted to 1/4" male 3/8"------ female square converted to 1/2" male 1/4"------ female square converted to 3/8" male NOTE: We offer a 30-day money-back guarantee and a 12-month replacement warranty.