Linear Motion Components & Mechatronic Actuators. FL (Perfect Steerable Transfer Carth) Closed Linear Plain Bearing. P (Perfect Steerable Transfer Carth) Closed Linear Plain Bearing Pillow Block. SFP (Perfect Steerable Transfer Carth) Simplicity Square Single Flange Mount. NIL-NIPDL (Perfect Steerable Transfer Carth) Steel Linear Shafting. Redi-Rail Linear Guide (Metric) - RR Rail and RRS Carriage. Redi-Rail Low Profile Linear Guide (Metric) - RRL34R