Come with two stair gauges, one holder and one Carabiner, easy to use and storage, It can also be hung on the work bag and storage rack to prevent lost. High Quality: This tall Stair Gauges are crafted from CNC-Machined Anodized Aluminum alloy which make it rust proof, durable and corrosion resistant Perfect Design: The hexagonal plane design more suitable for the edge than circle,The taller body allowing the ruler to be completely perpendicular to the material, extremely stable and accurate clamping of the workpiece, stair gauges come with a black oxide steel large thumbscrew, non-slip and durable, easy to grip and tighten onto any rafter square even when wearing gloves, the Anti-lost holder make you easy to carry Multi-function: Framing Square Attachments, Stair Gauge Knobs for circular saw, Stair stringer Layout, Using on carpenters square to mark repetitive angles, Using on carpenter square to guide saw to make angle cuts Professional: tall stair gauges it is a must-have for stair builders, You don't need to realign the framing square every single time to mark the next step. Ensure every stairs is very consistent, giving you an accurate framing jig layout every time Note: Doesnt currently fit Ruobi and DeWalt smaller plates due to lip around their plate edges. Works well with most framing squares, rafter or carpenter squares under 0.315" (8 mm) thickness