Note: The square specification of the jig frame is suitable for most frame squares, rafts, carpentry blocks less than 8mm thick. Please check this information carefully before you place the order PRECISE MARKING AND ANTI-SLIP: The square bracket adopts hexagonal plane, the frame is more fit and taller, so that the ruler is right angle, and the marking is more accurate. In addition, thumbscrews may increase friction and slippage, so you don't have to worry about clamping or tightening when wearing gloves Adopt aluminum alloy with anodized surface, stable structure, maintenance, sturdy and lightweight, not easy to break or deform, a practical tool for accurate layout KEYCHAIN DESIGN: The frame tool is equipped with a key chain, you can fix it on the belt, work bag, hanging hook and so on to prevent it from losing or falling off, and easy to access when you need it WIDE APPLICATIONS: Our square frame stairs have a variety of specifications and features, perfect for stair rope layout, rafting layout, repetitive angle marking, making woodworking and other tasks, Manufacturer: Netbiio