CONGRESS DRIVES V-belt pulley features precision sheaves with machined grooves and bores for high concentricity. Strong, rugged, built to last. Noncorrosive, nontoxic, and impact-resistant Fixed-bore die-cast V-belt pulley Zamak/zinc alloy Includes hollow-head setscrews This listing is for each. Technical Specification Pulley Type Standard V-Belt Pulley For V-Belt Section 3L, 4L, A Number of Grooves 1 Pulley Outside Dia. 10 in Pulley Bore Type Fixed Bore Pulley Bore Dia. 1/2 in Pulley Material Die Cast Zamak 3 Bushing Required None Fits Shaft Dia. 1/2 in 3L Belt Pitch Dia. 9.55 in 4L or A Belt Pitch Dia. 9.85 in Construction Spoked Set Screw Included Yes