GOINGMAKE corner clamps for woodworking tools are made of high quality aluminum alloy. Black hard anodization and laser marking make the clamps durable to use. Including 2 pack of clamping square and 2 pack fixing clamps. Easy to make 45 and 90 degrees joints. GM-G140 clamping square drop easily into any of the holes and secure the square faster and easier than separate “F” or “C” style clamps.