External key provides positive drive with no torque on the cap screws. We offer high torque carrying capacity. Double split barrel improves true concentricity. The shaft is gripped with positive clamp fit. Browning® Split Taper Bushing, 1-1/4 in Bore Dia, 2.7657 in Small End/2.875 in Large End Barrel Dia, 3-3/8 in Bolt Circle, 4-1/8 in Flange Dia, 17/32 in Flange Thickness, 3 Bolt Holes, 3/8 x 1-1/4 in Screw, For Use With: Browning® Multiple Groove Sheave, 2-1/2 in Overall Length, 1/4 x 1/8 in Keyway, Sintered Steel