<h3>Key features</h3><ul> <li>PACKAGE INCLUDED: 2 X SBR12 fully supported linear rail,4 X SBR12UU motion router solide block bearing</li> <li>PREMIER LINEAR GUIDING SYSTEM: Perfect combination of the main axle bearing rail and aluminum alloy support, which nicely stabilizes the original rail. Industrial-grade standard SBR block, with a high precision linear bearing inside.</li> <li>EASY TO USE: Aluminum alloy support rail with pre-drilled holes for ease of mounting.The linear guide rail can be applied to DIY CNC routers lathes and mills, Easy to install, no need to maintenance.</li> <li>HIGH-QUALITY STEEL MATERIAL: CNC parts linear rails are made of carbon steel, linear Bearings made of quality bearing steel with aluminum alloy housing. Surface chrome plating treatment beautiful anti-rust, high hardness, more durable.</li> <li>WIDELY USED:Suitable for installation on all kinds of machinery; such as: engraving machine, woodworking machinery, printing machinery, machinery, etc.</li> </ul><p>Free shipping included. 30-day hassle-free returns.</p>