Ametric S1611 Inch Steel Spur MPB Gear, 14-1/2 Deg 16DP, 11 Teeth, 3/8 Inch +/-1/16" Pilot Bore (B), 1/2" Face Width (F), 9/16 Inch Hub Dia (H), 0.4375 Inch Hub Projection (P), 15/16 Inch total width, 0.813 Inch OD, (1-125)