The Dual-Drive Spline Impact Bit Set provides versatile options for impact tool use. Its adaptor and locking coupler offer both 1/2" and 3/8" drives, catering to various applications like automotive repairs and machinery maintenance. Crafted from durable chrome molybdenum, the bits withstand rigorous use. With a 17mm Hex head, they accommodate spanners or ratchet wrenches in tight spaces. Packaged in an EVA foam storage tray, this professional set ensures convenient and organized tool storage. Features and Benefits Versatile impact tool set with dual-drive spline for 1/2" and 3/8" drives Hardened chrome molybdenum construction withstands rigorous use 17mm Hex head accommodates spanners or ratchet wrenches in tight spaces Conveniently packaged in an EVA foam storage tray for organized tool storage