V-Rail Linear Rail - V-Guide VRSD4-048 for Size 4 V-Wheels - Length: 48" Drilled Stainless Steel simplicity-linear-slide-assembly but the TWN blocks are

but the TWN blocks are larger

Ceramic-Coated Aluminum Feather-Weight Linear Shaft featuring a 2" diameter and 24" length

with a 1/2" ID (inner diameter) inside a housing made of aluminum alloy

a heat-treated alloy steel shell for durability and double seals for enhanced protection

not for linear ball bearings nor roller bearings

V-Rail Linear Rail - V-Guide VRSD4-048 for Size 4 V-Wheels - Length: 48" Drilled Stainless Steel simplicity-linear-slide-assembly but the TWN blocks areStainless Steel Linear V Rail, pre drilled 48" long, for Size 4 V wheels (60mm diameter roller bearings sold separately). This v groove rail is part of PBC Linears V Guide series. Constructed from 400 series stainless steel, it is polished for a high quality surface that minimizes friction and wear. Simple installation with a shoulder for precise mounting. The dual row angular contact design enhances load capacity for reliable high speed performance.