Feature:1. Hexagonal Shape: The hexagonal shape design fits better on the edges, can be completely perpendicular to the material, providing stable and accurate clamping for workpieces.2. Thumb Screw: The stair gauge comes with a black stainless steel thumb screw that is anti slip, durable, and easy to grip and tighten onto any rafter, even when wearing gloves.3. Main Applications: The stair gauge is mainly used for designing stair and beam structures. Its compact size makes it easy to store and transport.4. Practical in Use: Gives you an accurate framing jig and very precise layout, sturdy structure helps ensure the strength and durability.5. Quality Material: The stair gauge is made of high strength aluminum alloy material with an anodized surface that is wear resistant, corrosion resistant, and durable.Specification:Item Type: Stair Gauge KnobMaterial: Aluminium Alloy.Purpose: Rafter Gauge ClampPackage List:1 xStair Gauge Knob