Designed for use with the box rail. Packet without end caps. Made of durable one-piece, precision formed steel. Suitable for use with No 59, No 5100, No 5103 and No 5116 Box Rail. 2.14" roller diameter. 4-1/2" bolt length, 4.49" overall length, 1.61" overall height. Steel Deirin bearing. Zinc plated. Includes truck, connecting bolt and nuts. BHMA A138.18.