Precision Brand 47912 Worm Gear Clamps; Clamp Type: Worm Drive ; Minimum Diameter (Fractional Inch): 2-1/16 ; Minimum Diameter (Decimal Inch): 2.0625 ; Maximum Diameter (Decimal Inch): 12.3125 ; Maximum Diameter (Inch - Fraction - 4 Decimals): 12-5/1