The angle ruler is newly upgraded. It has a six-piece and six metal knobs that fold freely. Saves space and is easy to store.Simply adjust the knob to create the desired shape accurately. ;The aluminum multi-angle measuring ruler is made of extremely sturdy and lightweight aluminum alloy metal, including bolts. Metal knobs have a longer life and all parts are all metal. ;The solid metal bolts on the angle ruler are lifted and ribbed for easy grip! Our all-aluminum squares are more durable than plastic rulers, so you can take it wherever you work. ;Easy to Use: Simply place the angle template tool on your work area, slide the ruler into the desired shape, and tighten the bolts. One-handed operation with a unique fastening mechanism. ;Wide Application: Our multiangle template tool works great on carpentry, brick, tiles, wood, glass, stone, laminate, paving stones etc.You could select the metal angle measuring ruler as a gift for who work as builders, carpenters, roofers, woodworkers, architects, DIY enthusiasts, etc.