Smooth lever action and semi-automatic spring-loaded barrel does not allow for over or under compression of spring. Its unique square barrel design ensures superior stress load capacities over other round-barreled turnbuckles. And its exclusive trigger lock makes it the only lockable turnbuckle on the market! Each precision stainless steel piece comes with the legendary strength, quality and lifetime guarantee. Short 14 1/2-21 1/2". 2 per box.