Time is money and you shouldn't spend it unbolting and re-bolting safety shackles just to make an adjustment. The Lift Beam with Sliding Shackles allows you to simply slide the shackle to the desired location and lock it in place. It takes seconds rather than several minutes fumbling with a bolt nut and cotter pin. You get very close incremental adjustments too. This lifter is value packed, especially when working with large shackles where just bending the cotter pin can be a chore. Another unique gem from TANDEMLOC.