Features: Adopt high-quality aluminum alloy with anodized surface-, stable structure, reliable maintenance, sturdy- and lightweight, not easily to break or deform-, making them a practical tool for accurate layout. Accurate marking and anti slip: The speed square bracket adopts a hexagonal plane, with frame that fits more closely than the circle- and is higher-, making the ruler- perpendicular to the material and making the marking more accurate; In addition, thumb screws can increase friction and prevent slipping, so you don't need to worry about clamping and tightening when wearing gloves-. Widely used: Our square frame stairs have a variety of specifications and functions, making them ideal- for stair rope layout, raft- layout, marking repeated angles, and more, making your woodworking and other work efficient Keychain design: Frame tools are equipped with keychains, which can be clamped in places- such as belts, work bags, wall hooks, etc. to prevent them from being lost and falling, making them easily to access when needed. Kind reminder: The square- specification of the fixture frame is suitable for most frame square, rafts-, and carpenter blocks- with a thickness of less than 8mm-. Please carefully check this information before placing an order. Specifications: Material:Stainless Steel,Aluminium- Color:Blue,Black Size:Approx.4.2x1.96cm/1.65''x0.77'' Package Includes: 1Set Stair Gauge note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.