Ametric 30XL037 Aluminum ANSI Timing Pulley with Flange, 30 Teeth, .3125 Inch +/-1/16 Pilot Bore (d), 1.89 Inch Outside Diameter (De), 1.91 Inch Pitch Diameter (Dp), 0.5625 Face Width (F), (Ametric 1-081)