25H100TL.1610 Ametric® Inch Steel ANSI Timing Pulley with Flange, 1/2" Pitch for a H100 Synchronous Belt, 25 Teeth, for 1610 Taper Lock Bushing, 3.98 Inch Pitch Diameter, Without Hub, 1-1/4" Approximate Face Width, 1" Approximate Width Through Bore (Mfg Code 1-082)