Dasqua 6 Piece 12" long 5/16 to 6" telescoping Gage Set. Great tool for easy and accurate measurements of the true sizes of holes and slots. Self-centering, double action allows you to check inside measurements quickly. Rigid handles with smooth movement. Satin chrome finish. Constant spring tension for a uniform feel. Contact point ends are hardened tool steel that has been precision ground on a radius of the smallest hole the gage will enter. Measuring range is 5/16-1/2", 1/2-3/4", 3/4-1-1/4", 1 1/4-2 1/8", 2 1/8-3 1/2",3 1/2-6" and 8-12.7mm, 12.7-19mm, 19-32mm, 32-54mm , 54-90mm, 90-52.4mm. Supplied in a fitted case.