1.Dia 50mm-219mm, length 190-3400mm, which are used in the steel industry, harbor, coal industry, power industry, cement industry, etc 2.Tube: customize welded steel tube 3.Shaft: bright drawn steel to required bearing tolerance 4.Shaft end: both ends of tube are simultaneously machined and chamfered. 5.Bearing: single & double row deep groove ball bearing 2rz&2z with c3 clearance. 6.Seals: grease retaining inner seal with multi-stage labyrinth and retention cap with outboard rubbing flinger seal. 7. Lubrication: grease is lithium soap type grease with rust inhibitors. 8. Welding: mixed gas shielded arc welding end 9. Our roller saves on repair and maintenance costs of the conveyer belt due to the concentric design which decreases vibration.