1、High-quality material: It is made of anodized aluminum with black oxide stainless steel thumb screws, which is durable. The hexagonal plane has higher friction and better working performance. 2、High design: The ultra-high body allows you to remove edges and irregularities from the workpiece, to provide precise design of the frame fixture. 3、Main application: Mainly used for stair longitudinal beam layout, rafter layout, etc. It is easy to position on any material, especially when there is a crack on the edge of the wood. 4、Save time: It is very suitable for repetitive work, such as cutting rafters, longitudinal beams, and stairs. There is no need to realign the frame square every time to mark the next step. 5、Large knurled thumb screw: The large knurled thumb screw makes it easy to grip and tighten on any rafter square even with gloves.