Length (L, L1):- 28 mm Diameter 1:- 16,0 mm Diameter 2:- 17,5 mm Width Across Flat:- 11 mm Depth of Head (a1, t):- 9,0 mm Drive Connector Square (Female):- 3/8 inch Packing Unit:- 5 Piece Weight:- 0.03 kg Drive Connector Square (Female) Nominal Size:- 10 mm