Highly economical system of 1-1/2 IN steel conduit spindles, high-impact ABS plastic rollers and simple clips. . Rollers snap in and out of clips fast and easy. . Mounting clips fit onto the top of most I-Beam and C-Channel trays, so existing wire is not disturbed. . 8 IN (203. 2 mm) to 48 IN (1219. 2 mm) wide rollers are available, using expandable roller halves and 3 IN (76. 2 mm) PVC conduit. . Use Greenlee Cable-Cream (see p. 172) to lube spindle and roller. This lubricant is compatible with all cable insulation types.