Starrett 83B-6 Yankee Spring-Type Divider, Quick-Spring Nut, 6"/150mm Leg Length Bow spring is flexible yet strong to ensure reliable measurements Legs made of flat stock for durability Made from high-grade steel for long life Centrally located adjustment to ensure smooth action Straight legs are useful for marking out work pieces by scribing and marking distances between points Made from high-grade steel Legs made of flat stock Fulcrum stud is hardened Exceedingly strong bow spring Quick-adjusting automatic-closing spring nut saves time