Bushed Bore Sheave, Arm, Two Groove, Outside Dia 25.28 In, Fits Shaft Dia 1/2 to 2-15/17 In, SF Bushing Required, 4L or A Belt Pitch Dia 24.50 In, 5L or B Belt Pitch Dia 25.00 In, Gray Color, Durable Cast Iron Material, For Use With A, AX, B and BX Type V-belts