Small Hole Gauge Set Range 0.125 in to 0.5 in Contact Style Split Ball Maximum Measurement - Inch 0.5 in Maximum Measurement - mm 127 mm Minimum Measurement - Inch 0.125 in Minimum Measurement - mm 3.18 mm Number of Pieces 4 Overall Length 2 63/64 in 3 7/64 in 3 15/32 in 3 37/64 in Locking Style Knurled Nut Maximum Measuring Depth 5 in