CPC HRC 35 FN Z-B Linear Bearing 70mm x 110mm x 48mm Guide Rail 35mm x 40"Like New, in excellent shape. There is a layer of dust in the pictures but we opted to keep the oil layer on them, rather than wipe them off. 35mm rail width x 1015mm rail length. 40" Blocks per rail: 2 Block size: 70mm Width x 110mm Length x 48mm Height (from bottom of rail) Each block has 4 holes tapped 3 8" 16, placed in a rectangle 61. 8mm x 81. 15mm HRC: heavy duty series 35: 35mm F: flanged width N: standard length Z: with lubrication storage