Made of high-impact plastic that insures optimal Durability and usability.They are so easy to clamp and strong enough to not flex and very reasonably light and easy to work. It'll be a breeze to create the precision 90 angled woodwork, Both the inside and outside edges of these positioning squares tools can as exacting measuring guides. Embossed gradation are molded into the squares to provide convenient measuring guidance. Two Sizes Available,Two Combinations of 3inch and 4inch sizes, for more woodworking workpieces, meet your different needs. You'll have exactly what you need to create perfectly square boxes, drawers, cabinets, frames, furniture cabinets, etc. Some woodworkers even useful to incorporate them into their jigs and fixtures. Material:plastic colour:Red Package Contents: 4 * 4 inch angle ruler (about 10cm) 4 * 3 inch angle ruler (about 7.5cm) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.