100lb Load Capacity & 30 Years Service Life Cold rolled Q235 steel made.The max load capacity is up to 100lb.After professional institutions testing,the open-close times reached 100000 times. Full Extension & Ball Bearing Design 3-setions fold is convenient to fully open the drawer for easy access.Ball bearing design ensure drawer slides smoothly and silently. Double Anti-Rust Strength & Detachable Zinc Plating finish for anti-rust which is twice the traditional ordinary glides.Snap-on design makes the slides separate Easily,convenient to remove and install the glides. Installation Precautions There is an installation video and an instruction for reference;Ensure the size of selected slides the depth of drawer;Reserve 1/2 inch of clearance for mounting on both sides;The two glides must be mounted in parallel,orwill damage the glides;Mounting screws are INCLUDED.