Length (L, L1):- 31 mm Diameter 1:- 28,5 mm Diameter 2:- 25,8 mm Width Across Flat:- 21 mm Depth of Head (a1, t):- 13,5 mm Drive Connector Square (Female):- 3/8 inch Packing Unit:- 5 Piece Weight:- 0.083 kg Drive Connector Square (Female) Nominal Size:- 10 mm