Length (L, L1):- 29 mm Diameter 1:- 20,1 mm Diameter 2:- 18,7 mm Depth of Head (a1, t):- 11,0 mm Width Across Flat:- 9/16 inch Drive Connector Square (Female):- 3/8 inch Packing Unit:- 1 Piece Weight:- 0.036 kg Drive Connector Square (Female) Nominal Size:- 10 mm