Standard SBC linear rail system.
Low noise type in which the plastic spacer are inserted in between balls.
① C (Basic dynamic load rating), Co (Basic static load rating)
② *S: Bolt size for bottom mounting type of block.
③ *Q2: The hole of side grease nipple is not made to prevent a foreign substance from going into inside.
When you order the side grease nipple, we build it by ourselves.