<h3>Key features</h3><ul> <li>WHAT YOU GET:2PCS 500mm / 19.68inch (diameter:8mm) Linear Motion Rods ,4PCS Linear Slide Blocks(diameter:8mm) , 4PCS SK8 Shaft Support</li> <li>Rods Size:500mm / 19.68inch long(diameter:8mm) ,tolerance ± 0.5mm</li> <li>Material: Steel/Aluminum alloy/ Stainless steel / Brass</li> <li>Widely applied in 3D printer , CNC machine,automatic machine, molding machine, etc.</li> </ul><p>WHAT YOU GET:2PCS 500mm / 19.68inch (diameter:8mm) Linear Motion Rods ,4PCS Linear Slide Blocks(diameter:8mm) , 4PCS SK8 Shaft Support</p><p>Free shipping included. 30-day hassle-free returns.</p>