General description A 9 piece dual drive Star* impact bit set that allows the bit to be driven either via 1/2" D or 3/8" D power tools or wrenches. The 17mm Hex on the end of the bit also means that where space is tight, the bits can also be used in a 17mm spanner or ratchet wrench. Technical specifications Number of pieces: 9 Bit sizes: T30, T40, T45, T50, T55, T60, T70 Drive sizes: 1/2" D and 3/8" D Hex size: 17mm Material: Chrome molybdenum Other information Includes a 3/8" D / 17mm to 3/8" D impact adaptor Includes a 1/2" D locking coupler Presented in an EVA foam tray for convenient storage Hex and Spline profile sets also available (Laser Part Nos. 7977 and 7979)