Outside Firm-Joint Caliper Range 0.037 to 12 in/1 to 300 mm Joint Type Firm Maximum Measurement 300 mm 12 in Maximum Measurement - Inch 12 in Maximum Measurement - mm 300 mm Minimum Measurement - Inch 0.037 in Minimum Measurement - mm 1 mm Nut Type Solid Caliper Material Steel Leg Style Flat