Specifications:This chuck is the ideal replacement of worn or damaged one for trimming machine.It is made of high quality carbon steel, wear resistant and corrosion resistant.There are three kinds of hole diameter for your option, which can meet your various demands.Item Name: ChuckMaterial: Carbon SteelPurpose: Used for Chuck Conversion of Trimming Machine Engraving MachineQuantity: 2Pcs/Set or 3Pcs/SetFeatures: Durable, Milling Tool, Easy to UseSize Details:AB: Inner Diameter: 6mm (15/64"), Height: 16.5mm/0.65"; Inner Diameter: 8mm(5/16"), Height: 16.5mm/0.65" (Approx.)AE: Inner Diameter: 6mm (15/64"), Height: 16.5mm/0.65"; Inner Diameter: 6.35mm (1/4"), Height: 20.1mm/0.79" (Approx.)AC: Inner Diameter: 6mm (15/64"), Height: 20.1mm/0.79"; Inner Diameter: 8mm(5/16"), Height: 20.1mm/0.79" (Approx.)AR: Inner Diameter: 8mm (5/16"), Height: 6.9mm/0.27"; Inner Diameter: 6mm (15/64"), Height: 8.4mm/0.33"; Inner Diameter: 6.35mm(1/4"), Height: 8.6mm/0.34" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:2 x ChuckOr3 x Chuck