... ; 4. TBI brand qualtiy guantee. Linear guide shaft TBI brand Dia. 20mm supplied by SNE Application: 1.Optical axis is widely ... another is hollow cylinder linear shaft. cylinderlinear rail series: including Dia. size 6mm, 8mm, 10mm, 12mm, 13mm, 15mm,16mm, 20mm,25mm ... ,28mm, 30mm, 32mm, 35mm, 40mm, 45mm, 50mm, 60mm. ( image) , length can cut as per customer's requirments ...