V-Rail Linear Rail - V-Guide VR3-012 for Size 3 V-Wheels - Length: 12" Carbon Steel Simplicity Linear Plain Bearing with a 1/2" precision ID

with a 1/2" precision ID

for V-Guide Size 4 wheels

Closed Linear Ball Bearing with a 10mm ID (inner diameter)

Size 3 = 45mm outer diameter

In contrast

V-Rail Linear Rail - V-Guide VR3-012 for Size 3 V-Wheels - Length: 12" Carbon Steel Simplicity Linear Plain Bearing with a 1/2" precision IDV Rail Linear Rail, 12" long, matching Size 3 V wheels (45mm diameter roller bearings sold separately). This undrilled solid v groove rail is part of PBC Linears V Guide series. Constructed from induction hardened 1045 carbon steel, it is ground and 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