Description: Hexagonal:The hexagonal shape gives a more accurate layout , allowing the ruler to be completely perpendicular to the material, Fast setting the distance and one hand marking, convenient to do your woodworking cutting. Flat Slot:When the gauge is fully inserted into the slot, the scale is clearly visible through the flat slot, increasing the field of view for measurement. Material: Stair Gauges are Made of aluminum Alloy stainless steel thumbscrew. Hexagonal plane is more frictional and can work better,make it tough and durable. Used for:Staircase layout, rafter layout, carpenter square,tearing guide tool, angle guide speed block, keeping frame block upright, fixed drawing ruler, Suitable for most woodworking construction layout squares. Packaging:You can get two Square Gauges. Size Chart: 2.3cmx3cm/0.91inchx1.18inch Package Includes: 2 Stair Gauges Note: Please allow slightly errors due to manual measurement and different monitors.