👍APPLICATIONS: automation equipment, professional 3D printers, workbenches, lasers, stands, furniture, etc. machinery, fitness equipment, precision printers, automatic cutting machines, etc. 👍HIGH QUALITY: High-strength European standard aluminum profile, the surface is anodized, making the surface smoother and cleaner. 👍20 Series double v-slot 4040 aluminum extrusion profile made of 6063-T5 material, smooth surface, strong structure and long service life. 4040 V Type aluminum extrusion also fits T nuts. 👍 Great DIY ：4040 aluminum extrusion is a great framing material that offers endless architectural possibilities for your ideas, it allows for a variety of combinations and reuse, and is easy to assemble. 👍4PCS per package, H40mm * W40mm * L1500mm.