National Hardware N181-461 Box Rail Hangers, 4-1/2 Inch

Highlights:

• Material : Steel Bearings
• Size : 4-1/2 inch
• Designed for use with box rail
• Packed with connecting bolt and nuts. without end caps
• Durable one piece. precision formed steel
• Each hardened axle has 12 hardened and precision-ground alloy steel roller bearings
• Delrin seals keep out dirt while holding in long-life grease
• Safe working load 300 lb. per hanger