Flat Face Idler, Bearing Type Needle Roller, For Belt Type Back Side of V-Belts, Flat, Timing, Bore Diameter 1 in, Face Width 2.063 in, Outside Diameter 4.375 in, Pulley Material Cast Iron, Compatible Tightener Shaft Grainger Part Number 6AGL7, Face Diameter 4 in, Face Type Flat, For Use With Drive Tighteners, Hub Diameter 1 7/8 in, Length through Bore 2 1/2 in, Material Fabrication Cast, Maximum Radial Load at Speed 4328 lb @ 100 RPM