Specification Brand : Hyuduo BulletPoint1 : Drill bit is made from carbon steel and countersink is made from good quality 45# steel which ensures a long service life, high hardness and wear resistance, convenient and fast to drill a hole. BulletPoint2 : Five flutes design provides small chip loads and quicker removal, it can discharge wood sawdust more rapidly and smoothly.It can well meet your work needs and improve your work efficiency. BulletPoint3 : Combined drill bit and countersink bit is great for drilling, chamfering, deburring and countersinking help to improve the drilling efficiency. BulletPoint4 : There are 7 sizes of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm that meet you various need BulletPoint5 : Suitable for drilling holes on board of low hardness such as wood, plastic and other soft material with high hardness, strong cutting force and good wear resistance.Wide application range and high usability. ItemName : 7pcs Steel 5 Flutes Countersink Drill Bit Woodworking Chamfer Reamer Tools 3mm-10mm w Hex Key for Various Soft Material Drilling ItemPackageDimensions_Height : 5 centimeters ItemPackageDimensions_Length : 12 centimeters ItemPackageDimensions_Width : 5 centimeters ItemTypeKeyword : countersink-bits Manufacturer : Hyuduo ModelNumber : Hyuduo3e8bvraomn NumberOfItems : 1 PartNumber : Hyuduo3e8bvraomn ProductDescription : Spec: Features: Drill bit is made from carbon steel and countersink is made from good quality 45# steel which ensures a long service life. Combined drill bit and countersink bit is great for drilling, chamfering, deburring and countersinking. There are 7 sizes of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm that meet you various need. Five flutes design provides small chip loads and quicker removal, it can discharge wood sawdust more rapidly and smoothly. Suitable for drilling holes on board of low hardness such as wood, plastic and other soft material.