Anodized aluminum alloy: Made of high-quality aluminum alloy, the surface is anodized to prevent discoloration in high temperature environments. Bolts are not easy to break, durable, reusable, easy to carry 211 to 60 inches Length range: The joints of the stair ruler can be combined and stretched in any way, and the length can slide in the range of 11 to 60 inches (including the width of the stair ruler on both sides) . The rulers on both sides of the stair tread gauge measure up to 10 inches 3 Adjustable Rulers: The stair tread template tool simultaneously measures the length and width of boards so that all boards meet the same specifications. The rulers on both sides of the stair fixture are adjustable to suit the angle of the stair 4 EASY TO OPERATE: The stair tread gauge and shelf layout tool are easy to operate and cut perfectly, the tool locks securely into place with 4 knobs 5SCOPE APPLICATIONS: Stair tread measuring tool available Suitable for cutting and measuring stair treads, stair risers, shelves, window sills, wardrobe shelves and some angle layouts Project Type: Stair Tread Gauge Template Tool Material: Aluminum Alloy Measuring Range: 11-60 inches Operation: Tool securely holds with 4 knobs Lock in place, insert the stair rail between the two walls, stretch and tighten the screws to measure the length and side angle, and you are ready to use Scope: Stair Step Measurement This tool can be used to cut and measure stair steps, stair risers, shelves , window sill, wardrobe shelf and some angle layout 2 x dial 2 x A16 inch pull rod 2 x B12 inch pull rod 2 x C8 pull rod 10 x M5 screw 10 x M5 knob 1 x washer