Feature: 1. STRONG HARDNESS: The linear bearing is made of Gcr15 bearing steel with heat treatment process and has sufficient hardness. 2. FINE MADE: The linear motion ball bearing is fine made with higher precise and smoothly surface, can fit the device perfectly. 3. HIGH SPEED: This flange linear ball bearing has low friction and high rotation speed, can be used in highly demanding locations. 4. LASTING USE: The round flange linear bearing has low noise and strong bearing, not easy to heat, ensuring lasting durability. 5. WIDE APPLICATION: This linear bearing can be used in gear box, instrument and meter, motors, household appliances, etc. Specification: Item Type: Round Flange Linear Ball Bearing Material: Gcr15 Bearing Steel Model: Round D40 Guide Shaft Support Inner Diameter: Approx. 40mm/1.6in Use: Can be used in gear box, instrument and meter, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, engineering machinery, etc. . Package List: 1 x Round Flange Linear Ball Bearing