Comparison : Item # 1592T1, 11mm Width Steel Crowned Track Roller with Seal
Item # 1592T2, 11mm Width Steel Crowned Track Roller with Seal
Item # 1592T3, 12mm Width Steel Crowned Track Roller with Seal
Item # 1592T4, 12mm Width Steel Crowned Track Roller with Seal
Item # 1592T5, 14mm Width Steel Crowned Track Roller with Seal