Support Rail for 1.5" Linear Shafts - Aluminum SR24-024.000-SL Length: 24"Linear support rail, undrilled, 24" in length and made for a 1. 5" diameter linear shaft, sold separately. A support rail is a linear rail on top of which shafts can handle heavy loads without sagging or binding. This solid aluminum rail, made in the USA with advanced cold stamp manufacturing, pairs with shafts on which run open shelled linear bearings or roller bearing pillow blocks. Linear Support Rail Only Shafts sold separately Solid Undrilled;