Precision Half Ball Small Hole Gauge Set - 5-Piece Measuring Tool Kit for Machinists & Engineers - Perfect for Measuring Internal Diameters, Bore Sizes & Small Openings in Automotive, Plumbing & DIY Projects

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. Measuring Range .125 - .200” 3.2 - 5.1mm .200 - .300” 5.1 - 7.6mm .300 - .400” 7.6 - 10.2mm .400 - .500” 10.2 - 12.7mm