Williams GS-1 Master Feeler Gauge Set
The Snap-On JH Williams GS-1 master feeler gauge set has a thickness range from .0015 to 1/32-Inch and has 25 blades. Both the decimal and equivalent metric size is etched in each blade. The gauges are supplied in a holder with a knurled lock nut which allows the user to select the required blade size and lock it into position. These are heavy duty machine shop tools.