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 them with the specific 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 provide a dedicated storage place to prevent loss.They are also very light and easy to store.It can be hung on the work bag, magnetic tool storage panel and storage rack.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 speed square to mark repetitive angles - Using on speed square to guide saw to make angle cutsMaterial:Aluminum alloycolour:bluePackage Contents:4 x Auxiliary Clip Square RulerOnly the above package content, other products are not included.Note: Light 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.