8.75" Outside Diameter , Fits 1-3/8" Shaft Diameter. 5/16 Keyway Is Standard For 1-3/8" Shaft, 213T & 215T Frame Motors. (Keyway Included). This 2 Piece Cast Iron Single Groove Pulley Takes 2 Belts And Includes The " H " Style Tapered Bushing. Groove Will Fit The Following V-belt Type (5/8" Top Width 5l / 5lk / B / Bk / Bx ). This Pulley Will Also Fit 1/2" Top Width Belts ( A / 4l / Ak / 4lk / Ax ) However The Belt Will Sit 1/4" To 1/2" Deeper In The Grooves On Average. The Tapered Bushing Locks onto Your Motor Shaft as You Screw Down the Lock Screws, Resulting in a Super Tight Industrial Tapered Lock. Motor Pulley Is Made of Cast Iron, The H Bushing Is Made from C45 Steel with Black Oxide Finish. 8.75" Outside Diameter, Cast Iron 2BK90H Pulley with smooth-surface engineered for rigorous use, long life and minimal maintenance. This is a 2 piece bushing style pulley that includes the H pulley and Tapered H bushing. Electric motor frame size guide. ...... 5/8" Shaft diameters are found on 56, 56H, 56Y Frame motors ........ 7/8" Shaft diameters are found on 56HZ, 145T, 182Y Frame motors.......... 1-1/8" Shaft diameters are found on 182T and 184T frame motors.......... 1-3/8" Shaft diameters are found on 213T and 215T frame electric motors