Specifications Name: Adjustable Backrest Set Square Material: Aluminum alloy Size S:197*197*276mm/7.76*7.76*10.87inch L:329*329*462mm/12.95*12.95*18.19inch Description: Main body: High quality aluminum alloy, high hardness, deformation resistance, surfacing oxidation, rust and corrosion resistance Scale: Laser scale technology, clear and precise, not easy to wear and fall off after long-term use Adjustment components: Clock adjustment needle, precise positioning angle moving support rod, smooth adjustment and firm positioning, with a maximum movable angle of 70 ° Purpose: Woodworking: furniture angle positioning, board cutting angle calibration, circle drawing operation Drawing design: engineering drawing, angle drawing for manual drawing, precise drawing of lines and circles DIY scenario: angle positioning and measurement for handmade production and model assembly, improving the accuracy of the work Package 1PC Adjustable Backrest Set Square