Features: High strength aluminum extrusions are made of aluminum alloy,black anti-oxidation surface treatment,the surface is anodized. Aluminum profile extrusion products are a good linear motion material with high strength and adjustable. It can be fixed on the side of 4 grooves such as M3, M4, M5 T-slot nut and pulley. V Type is a generic 2020 rail and can for Normal 2020 Extrusion hardware and accessories. Used for automation equipment, professional 3D printers, workbenches, lasers, stands, furniture, etc. machinery, fitness equipment, precision printers, automatic cutting machines, etc. The for T slot features smooth rounded edges and is for ZYLtech branded accessories. Specifications: Material: aluminum alloy Size: 20/10cm / 7.87/3.94inches Colour: Black Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1Set x Voron v0 profile kit