Features ALUMINUM ALLOY MATERIAL: The stair gauge is made of premium aluminum alloy with anodized surface, which is stable and durable. HEX FLAT DESIGN: More suitable for edges rather than circles, with a higher body that makes the ruler completely perpendicular to the material, ensuring very stable and accurate clamping of the workpiece. THUMB SCREWS: Framing jig is equipped with black oxidized steel thumb screws, which are anti slip and durable, easy to grip and tighten to any raft frame, and can be easily carried even when wearing gloves. FRAME SQUARE ATTACHMENT: Stair instrument knob for circular saw, layout of stair string, use carpentry square to mark repeated angles, and use carpentry square to guide saw for angle cutting. EASY TO USE: Small size and being lightweight make the frame jigs easy to use, easy to carry and move to meet different use needs. Specification:Item Type: Stair Gauge Material: Stainless Steel, Aluminum Alloy  Package List:1 x Stair Gauge Package List 1 x Stair Gauge