Lengthened size: It is very suitable for stair stringer layout, rafters layout, etc. It can be easily laid out on any especially when the wood has gaps. Recessed incisions: Aligned them with specific ruler marks on the frame square. When the corner cutter is fully inserted, the ruler marks can be seen through the recessed incisions, increasing field of view area. A variety of functions: stair stringer and rafters layout, circular guide frame square accessories, use to mark repeated angles on square, use to guide the on square for cutting. Aluminum Alloy Stair gauges are anodized aluminum alloy. More frictional and can work better. Dedicated storage: The gauge is equipped with a wire rope to provide a dedicated storage location to loss. They are also very light and easy to store. It can be hung on work bags, tool storage panels, and storage racks. Size:Approx.73x25mm/2.87x0.98inches Colour:Red Material:Metal Package Contents: 1 x Holder 2 x Accessories 1 x Portable Clip Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.