Accurate: This product has a hexagonal plane that fits borders a circle, and it's taller so that the ruler is perpendicular to the material, making your marks more precise Wide Use: The woodworking square gauge knob tool is suitable for framing squares, circular saws and carpentry squares, and a variety of angle rulers can be used, with a stable and firm clamping Easy to Use: These stair gauges are great for repetitive work, marking and cutting on rafters, trusses and stairs Aluminum Alloy Construction: The Tall Stair Gauges are crafted from aluminum alloy with an anodized finish, ensuring a stable, robust, and structure that's to breaking or deformation Convenient: the set includes 2 auxiliary clips,1 hook, which can keep the gauge organised and easy to use in the project, Manufacturer: Duanthry