"Chicago Die Casting 250A 5/8"" Pulley with 2 1/2"" Single V Groove Chicago Die Casting 250A 5/8"" Pulley with 2 1/2"" Single V Groove Features: All pulleys have 0 spokes except 600 A series which has 4 spokes Bore diameter 5/8"" 2 1/2"" outside diameter, 2 1/4"" pitch diameter Carded"