Countersinks are made from good quality high speed steel which ensures a long service life. Hex shank size 1/4 (6.35mm) and includes six cutter sizes of 6mm 8mm 9mm 13mm 16mm 19mm. Ideal for chamfering deburring and countersinking. Five flutes design provides small loads and quicker removal. Can discharge wood sawdust more rapidly and smoothly in the process of using. Suitable for board of low hardness such as wood plastic and other soft material. Cannot be used for metal. Specifications: Material: HSS Cutter: 6mm / 0.23 8mm / 0.31 9mm / 0.35 13mm / 0.51 16mm / 0.63 19mm / 0.75 Hex Shank: 6.35mm(1/4) Length: 48mm / 1.89 Flute: 5 Angle: 90 Weight: 124g(approx.) Package Includes: 2pcs x Countersinks(6mm 8mm) 4pcs x Countersinks(9mm12mm16mm19mm) 6pcs x Countersinks(6mm 8mm 9mm 12mm 16mm 19mm ) Note: Monitors are not calibrated same item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. DIY Supplies:Woodworking Certification:NONE Type:Core Drill Bit Origin:CN(Origin) length:48MM Use:Wood Drilling Model Number:GMJJ4362 Material:High Speed Steel Material:High Speed Steel Model Number:6mm,8mm,9mm,10mm,12mm,16mm,19mm Type 1:90 Degree Chamfering Cutter Tool Type 2:Chamfer Drill Press Power Tools Type 3:Drilling Drill Type 4:Countersink Drill Bit Type 5:Woodworking Tools Type 6:90 Degree Cutter Drill