Tapped Hole Location Gages - Various SizesTapped Hole Location Gages These hole location gages are used to measure the location of a threaded hole in a product, typically with a CMM. These Hole Location Gages that are larger than #10 (M5) are slotted at 90 increments, while the Hole Location Gages #10 (M5) and smaller are of solid construction with front taper covering the entire product tolerance. Both styles insure positive location on the thread flank regardless of the size of the hole