Manufacturer Part Number: 49501|System Compatibility|Ball LockOutside Diameter (mm)|Outside Diameter (Decimal Inch)|1.6873in; 1.6873Inside Diameter (mm)|20.00; 20mmOverall Height (Decimal Inch)|0.637inMount Type|Bolt-In RecessedNumber Of Mounting Holes|3Bolt Circle Diameter|1.362inFor Minimum Base Plate Thickness|1inFor Clamp Shank Diameter|20mmAdditional Information|PSC Code|UNSPSC Code|