Standard Linear Bearing Inside Dia 1/2 in Outside Dia 7/8 in Material Anodized Aluminum Accelerated Speed 14 Feet/Second Color Red Dimension B 0.875 in Dimension C 1.25 in Dimension C1 - Dimension C2 - Dimension d - Dimension D1 - Dimension E 60 in Dimension F 0.136 in Dimension G 5/8 Dimension L - For Use With Support and Feather Rails Inside Dia Tolerance +/-0.001 Length 1 1/4 in