Impact Driver Set 15 Piece 1/2in DriveA 15 Piece heavy duty Impact Driver Set in a robust oil resistant case. When used in conjunction with a medium sized hammer, an impact driver will loosen or tighten stubborn screws and bolts. Contents : 12 x Impact bits: 6 x 36 Flat, 8 x 36 Flat, 10 x 36 Flat, 12 x 36 Flat, PH1, PH2, PH3, PH4, 4 mm Hex, 5 mm Hex, 6 mm Hex, 8 mm Hex 1 x 1 2in Drive heavy duty reversible impact driver 1 x 1 2in Drive impact coupler adaptor 1 x Hex x 3 8in male adaptor