Description Easy-to-use instrument combining the functions of a parallel straightedge, triangle protractor, T-square, and compass. One of the most useful and convenient aids for drafting, drawing, and nautical applications. Smooth gliding action makes parallel lines without twisting or turning under pressure. 25 cm (10″) rolling straightedge Draw parallel lines with ease and accuracy Draw circles up to 40 cm in diameter using holes at 1cm intervals Draw and measure angles using 1 degree increments Aluminum roller bar for smooth-gliding action Non-skid rubber rings for firm grip on any surface Durable acrylic blade with printed graduations Three sides with edges graduated in millimeters
