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 Standard V-Belt Pulley, For V-Belt Section 3L, 4L, A, Number of Grooves 1, Pulley Outside Dia. 8.00 In., Pulley Bore Type Fixed Bore, Pulley Bore Dia. 5/8 In., Pulley Material Die Cast Zamak 3, None Bushing Required, Fits Shaft Dia. 5/8 In., 3L Belt Pitch Dia. 7.55 In., 4L or A Belt Pitch Dia. 7.85 In., Construction Spoked, Keyway Size 0.187 In. x 0.093 In., Set Screw Included Yes