Specifications:The deburring tools are made good quality high speed steel which ensures a long term use.It is ideal for chamfering, deburring and countersinking.flutes design provides small chip loads and quicker removal.Item Name: Countersinks And Deburring ToolMaterial: High Speed Steel 4241Quantity: 4Pcs/SetFeatures: Round Shank, 90 Degree, Easy to UseAngle: 90 DegreeSize Details:2-5: Holes Range: 2mm - 5mm/0.08" - 0.2" , Shank: 6mm/0.24", Head Diameter: 9.7mm/0.38" (Approx.)5-10: Hole Range: 5mm - 10mm/0.2" - 0.39" , Shank: 8mm/0.31", Head Diameter: 14mm/0.55" (Approx.)10-15: Hole Range: 10mm - 15mm/0.39" - 0.59", Shank: 10mm/0.39", Head Diameter: 21mm/0.83" (Approx.)15-20: Hole Range: 15mm - 20mm/0.59" - 0.79" , Shank: 12mm/0.47", Head Diameter: 28mm/1.1" (Approx.)Note: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:1 Set of Countersinks And Deburring Tool (Different Size)