1、High Quality Material: It is made of anodized aluminum with black oxide stainless steel thumbscrews, which is durable. Hexagonal plane has greater friction and better working performance. 2、Tall Design: The ultra high body enables it to remove the edges and irregularities of the workpiece, so as to provide accurate frame fixture layout. 3、Main Application: It is mainly used for stair longitudinal beam layout, rafter layout, etc. It is easy to arrange on any material, especially when there is a crevice at the edge of the wood. 4、Save Time: It is very suitable for repetitive work, such as cutting rafters, longitudinal beams and stairs. You don't need to realign frame square every time to mark the next step. 5、Large Knurled Thumbscrew: The large knurled thumbscrew makes it easy to grip and tighten onto any rafter square even when wearing gloves.