Perfect for stair stringers layout and rafter layout, allowing the ruler to any conventional framing square or carpentry square. Fast setting the distance facilitates the marking of stair stringers and other recurring right-angle measurements. The Stair Gauges enable the gauges to securely clamp onto any carpentry square, framing square gauge allows you to grip and tighten the carpenter square quickly even with gloves on, and gives you a seriously accurate layout. Using on carpenter square to repetitive angles is perfect for setting down precise stair stringers or repetitive cuts. stair is , giving you an accurate framing jig layout time, these Stair Gauges are made of high-quality aluminum with an anodized surface with a stainless steel thumbscrew. Framing square attachment / Stair stringers and Rafter layout / Rip guide for the circular saw / Using on to repetitive angles / Using on to guide saw to make angle cuts Colour: Black : Aluminum Package Contents: 1pcs Tall Stair Gauges 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.