Select THK Catalog Number Tables Copyright 2005, Optinet Inc sizingtools.com Model Number 1 2 3 4 UU SS ZZ DD KK No. of Blocks mounted on a single rail End Seal Type Radial Clearance cut & paste from Tables Block Material Rail Length ( in mm ) Accuracy Grade Rail Material No. of rails RETURN Selected Catalog Model - C1 C0 - M - H P SP UP - M I II III IV cut & paste from