From Fine Woodworking Review: "These corner clamps from Viking Mountain Tool Works do a great job holding cabinet and box parts in position while you screw or otherwise join them together. They adjust easily and hold firmly, leaving room for screw access as well as bar clamps for glued joints Enough clamps to build one drawer top and bottom at the same time. These corner clamps are made from rugged engineered plastic. You can clamp different sizes of material from just under 1/8 inch to just over 1 inch Very easy to use for pocket hole jig projects. perfect for aligning, nailing, woodworking, welding, screwing, making cabinets, box, and picture frames，assemble bookshelves. Multi-purpose Use: It is suitable for woodworking, cabinet and furniture repair connection, photo frame reinforcement, wooden DIY project, etc.. Much easier to use and stronger then spring corner clamps with larger working capacity

These corner clamps are made from rugged engineered plastic. Much easier to use, more versital and stronger then spring corner clamps. Made to clamp big drawers, and cabinet parts. This listing is for a pack of 12 clamps.