INSIZE Telescoping Gage Set 6 pcs Features Include... Self centering feature for quick measurement of inside diameters of hole and width of slots Both gaging ends are heat treated stainless steel and ground to a sphere Satin chrome finish Supplied in storage pouch Gages included in set... 5/16" to 1/2" (8mm to 12.7) 1/2" to 3/4" (12.7mm to 19mm) 3/4" to 1-1/4" (19mm to 32mm) 1-1/4" to 2-1/8" (32mm to 54mm) 2-1/8" to 3-1/2" (54mm to 90mm) 3-1/2" to 6" (90mm to 150mm)