Fully machined from solid 416 stainless steel, these premium-quality links are critical for ensuring you have the precise amount of vertical lockup needed for best accuracy from your pistol. Available in nominal Colt spec .278" between the centers of the holes, with two oversized and two undersized models in .005" increments. Available in a set of all five. Perfect for fine-tuning the lockup of a Nighthawk Match Grade Barrel.