Telescoping Gauge Set, Range 5/16 in to 2 1/8 in, Gauge Plunger Style Double-Arm Plunger, Included Gauge Ranges 1 1/4 in to 2 1/8 in / 32 mm to 54 mm, 1/2 in to 3/4 in / 13 mm to 19 mm, 3/4 in to 1 1/4 in / 19 mm to 32 mm, 5/16 in to 1/2 in, 8 mm to 13 mm, Maximum Measurement - Inch 2 1/8 in, Maximum Measurement - mm 54 mm, Maximum Measuring Depth 2.375 in, Minimum Measurement - Inch 5/16 in, Minimum Measurement - mm 8 mm, Number of Pieces 4, Construction Steel, Includes Protective Pouch