This is a brand new chrome steel power steering pulley made from heavy gauge steel with a deep groove to prevent belts from slipping. This pulley is single groove. Fits GM & Chevy 1967-84 with keyway and 5/8 shaft. Diameter is 5-3/4". Works great with GM Saginaw Keyway style power steering pumps and short or long water pumps. Use with Big Block Chevy and Small Block GM Engines (265, 283, 305, 327, 350, 383, 400, 396, 427, 454, 472, 500, 502, 326, 455, 389, 403).