Features DURABLE ALUMINUM ALLOY The Crafting T square ruler is made of CNC processed anodized aluminum alloy, which is rust-proof, durable and corrosion resistant, has a smooth surface and does not hurt hands. ACCURATE DESIGN The T-square ruler features an ergonomic design that reduces stress on the elbow or wrist. The edge is machined at a bevel angle of 25 degrees, and the bevel design reduces parallax and improves measurement and marking accuracy. Main purpose: T-square ruler protractor angle finder is used for drawing lines, measuring, supporting 0 to 90° parallel and vertical marking. ADJUSTABLE ANGLE MARKING: By moving and rotating the adjustable angle display of the T-square ruler, you can adjust any angle from 0° to 180° to improve accuracy and save measuring time. CLEAR MEASURE: The scale lines of the carpenter's ruler are laser printed and the easy to read scale is bright and white on a red design. Specification: Item Type:T Square Ruler Material: aluminium alloy. Use: line drawing, measurement Application: 0~90° parallel vertical lines Package list: 1 x English Angle Marking Ruler 1 x angle probe holder. 2 x set screws. 1 x fixed nut. 2 x washers. 4 x screws Package List 1 x English Angle Scribing Ruler 1 x Angle Measuring Probe Holder 2 x Set Screw 1 x Tight Nut 2 x Washer 4 x Screw