This Old House

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Feature

Set of four small hole gauges for measuring holes, slots, grooves, and recesses in woodworking, metalworking, machining, layout, and pattern-making applications
Measuring range of 0.125 to 0.5"/3.2 to 12.7mm
Half-ball measuring surface with flat base is hardened and ground for two-point contact in shallow slots and recesses
Safety stop prevents gauge from adjustment beyond its range
Includes protective case for storage