3/8" drive impact coupler adaptor for holding 1/4" hexagon bits Chrome molybdenum for use with power tools ANSI standard design for use with power tools with a ball bearing socket retainer Black phosphate finish for easy identification as an impact socket accessory Knurled grip for a better grip particularly in wet or oily conditions Retaining spring to hold the bit in place Supplied with a metal socket clip for use with a socket rail