Compatible with square, framing or carpentry square, this stair gauge locks on to standard step heights in 10 seconds, eliminating the need for traditional repetitive adjustments, allowing for error-free stair stringing and repetitive measurements. 4 Pcs stair gauges with holder & hook. Dimensions per gauge: 4.7 x 2.1 cm/1.85 x 0.83 inch. Compatibility up to 0.315inch(8 mm) thick, compact in size, making them easy to store and carry anywhere. Made of aluminum material with anodized , stair gauge is designed with a hexagonal that fits the boundary a circle, and it's taller so that the ruler is perpendicular to the material, making your marks more precise, strong and , not easy to break or deform. The clamping table saw tool is fixed, and it is used as a backer. When the bottom distance is too short, the two heads are interchangeable and clamped upside down. Use 2 clamps, it is possible to stand and inspect vertically. Triangular ruler angle marking, can be to clamp and fix the desired angle, and draw lines with a pen. The rectangular ruler is used as a stair gauge, fixed with 2 clamps, and is drawn with a pen. The ruler draws at a fixed distance, and the desired length can be to clamp and fix, and is drawn with a pen. Color:Black Material:Aluminum Alloy Package Contents: 4 * framing jig Only the above package content, other products are not included. Note: Light reflection 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.