1. Stainless steel; 2. Precision grade: g6; 3. Chrome plating; 4. TBI brand qualtiy guantee. Linear guide shaft TBI brand Dia. 20mm supplied ... by SNE Application: 1.Optical axis is widely used in Industrial automatic ... Dia. size 6mm, 8mm, 10mm, 12mm, 13mm, 15mm,16mm, 20mm,25mm,28mm, 30mm, 32mm, 35mm, 40mm, 45mm, 50mm, 60mm. ( image) , length ...