Big Kaiser OSL1.250-.750 Milling Chuck Collets; Inside Diameter (Decimal Inch): 0.7500; Inside Diameter (Inch): 0.75 in; Outside Diameter: 1.25 in; Outside Diameter (Inch): 1.25 in; 1-1/4; Through Coolant: None; Overall Length: 2.6000 in; PSC Code: 5