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