1.Extension adapters are made of heat-treated chrome vanadium steel and socket adapters are made of high carbon steel , with black coating to prevent rust and corrosion for long-term use 2.Hex shank bit driver extension set provides extra reach during repairs to reach into hard-to-reach spaces 3.Versatile usage for impact, DIY, furniture repair, and woodworking. 4.Features spring-loaded detent balls and through-holes for efficient and secure socket holding. 5.Set includes: 4 x1/4", 2 x 3/8" and 2 x 1/2" drivers and 4 socket adapters: 1/4" to 3/8", 3/8" to 1/4", 3/8" to 1/2", 1/2" to 3/8", Weight: 0.661386786 Pounds, Manufacturer: QWORK