Lengthened size-Perfect for stair stringers layout, rafter layout, etc.Easy layout on any material,especially when there are Crevice in the edge of the wood. Patented product.Recessed cutout-Align with the ruler marks on the frame square, the ruler marks can be seen through the concave cut when the gague is fully inserted,increase visual field area. Dedicated storage-The gauge is equipped with steel wire rope to a dedicated storage place to prevent loss.They are also very light and easy to .It can be hung on the work bag, magnetic tool storage panel and storage rack. Material-Made of anodized aluminum alloy.Hexagonal plane is more frictional and can work better. Multiple functions-Stair stringers and Rafter layout - Rip guide for circular saw - Framing square attachment - Using on to repetitive angles - Using on to guide saw to make cuts Colour: Red Material: aluminum alloy Package Contents: 2 x Auxiliary Clip Square Ruler Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.