Half ball - flat bottom construction; for measuring inside diameters or widths of small shallow holes or slots where regular gages are not accessible. Each set consists of the following 4 gages in a plastic wallet: (.125 - .200" / 3.2 - 5.1mm), (.200 - .300" / 5.1 - 7.6mm), (.300 - .400" / 7.6 - 10.2mm), (.400 - .500" / 10.2 - 12.7mm).
