Item - Timing Belt Pulleys: Industrial Timing Belt Pulley; Gearbelt Series - Timing Belts: L; Pitch - Timing Belt Pulleys: 3/8 in; For Timing Belt Width: 1/2 in; Number of Grooves - Timing Belt Pulleys: 21; Bore Type - Timing Belt Pulleys: Bushed; Pitch Dia. - Timing Belt Pulleys: 2.507 in; Outside Dia. - Timing Belt Pulleys: 2.477 in; Width - Timing Belt Pulleys: 3/4 in; Material - Timing Belt Pulleys: Steel; Bushing Required - Timing Belt Pulleys: G; Flanged: Yes; Flange Dia.: 2 3/4 in; For Use With: 1/2 in Wide Belt, 3/8 in Pitch; Construction: Solid; Application: Timing, Up to 4 HPSpecification: Item - Timing Belt Pulleys: Industrial Timing Belt Pulley; Gearbelt Series - Timing Belts: L; Pitch - Timing Belt Pulleys: 3/8 in; For Timing Belt Width: 1/2 in; Number of Grooves - Timing Belt Pulleys: 21; Bore Type - Timing Belt Pulleys: Bushed; Pitch Dia. - Timing Belt Pulleys: 2.507 in; Outside Dia. - Timing Belt Pulleys: 2.477 in; Width - Timing Belt Pulleys: 3/4 in; Material - Timing Belt Pulleys: Steel; Bushing Required - Timing Belt Pulleys: G; Flanged: Yes; Flange Dia.: 2 3/4 in; For Use With: 1/2 in Wide Belt, 3/8 in Pitch; Construction: Solid; Application: Timing, Up to 4 HPWarning: California Residents: This product and/or packaging can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm.