Standard Linear Bearing Inside Dia 30 mm Outside Dia 47 mm Material Anodized Aluminum Accelerated Speed 14 Feet/Second Between Grooves (mm) 48 Color Blue Dimension B 47 mm Dimension C 68 mm Dimension C1 - Dimension C2 - Dimension d - Dimension D1 - Dimension E - Dimension F - Dimension G - Dimension L - For Use With Linear Motion Shafts Inside Dia Tolerance +/-0.001 Length 68 mm