LINEAR BEARING, RUNNER BLOCK, SLIMLINE, STANDARD HEIGHT. B.RUNNER BLOCK CS KWD-020-SNS-C1-N-1. Different preload classes Optimized entry-zone geometry and high number of balls minimize variation in elastic deflection Attachments on the Ball Runner Block can be mounted from above Integrated all-around sealing Minimum quantity lubrication system with integrated reservoir for oil lubrication End-face fastening thread for all attachments Can be used on all SNS/SNO Ball Guide Rails Excellent dynamic characteristics Ball Runner Block pre-lubricated at the factory.