Fitment:For roof racks, Crossbars or T-slot roofs. Material:Made of rugged,lightweight anodized aluminum,durable,anti-corrosion and anti-rust. Function:Load stop kit helps secure load to crossbar, hold items in place.For example: ladders, wood, kayaks, etc. Feature:Simple installation without drilling. The multi-function rotary button can adjust the position and fix the product. Comes with a rope hook, so that the items are placed more firmly. Steps:Easy to install, no tools required. Just align the convex groove on the bottom of the product with the card groove of the luggage rack, then push it into the card groove, and finally fix it with screws, and the rotary button can be adjusted to the position you want. Note:Before purchasing, please confirm whether the bottom groove is suitable for your luggage rack crossbar.