Specification Brand : HARFINGTON BulletPoint1 : Size - Shank diameter: 4mm; cutting diameter: 4mm; cutting length: 22mm; total length: 45mm; cutting hardness: HRC44-46; helix angle: 30 degree. BulletPoint2 : Material - Made of high-hardness tungsten steel, spiral cutter is wear-resistant, corrosion-resistant and has good cutting performance. The polished surface of milling cutter is flat and smooth, reducing material adhesion during cutting. BulletPoint3 : Feature - 2 flutes and spiral design of the end mill router bits facilitate the smooth discharge of chips and avoid blockage during cutting. Precision cutting edges ensure clean and accurate cutting. BulletPoint4 : Application - The up cut spiral router bit is suitable for side milling, finishing, grooving, stamping, engraving and other processing of cork, hardwood, plywood, laminate, oak, MDF, etc. Can be used with cnc routers and handheld routers, etc. BulletPoint5 : Notice - Be careful to avoid excessive and too fast feeding. It is recommended to use suitable coolant or lubricant during use to dissipate heat and extend tool life. ItemName : HARFINGTON 5pcs Spiral Router Bit 4mm Cut Dia 2 Flutes Up Cut End Mill Bits Milling Cutter for Wood Carving Engraving (4mm Shank 22mm Cut Length 45mm Long 30 Degree Helix HRC44-46) ItemPackageDimensions_Height : 0.59 inches ItemPackageDimensions_Length : 5.51 inches ItemPackageDimensions_Width : 3.94 inches ItemPackageQuantity : 5 ItemTypeKeyword : spiral-router-bits Manufacturer : HARFINGTON Material : Tungsten Steel NumberOfItems : 5 PartNumber : htf240629hh000953 ProductDescription : Made of high-hardness tungsten steel, spiral cutter is wear-resistant, corrosion-resistant and has good cutting performance. The polished surface of milling cutter is flat and smooth, reducing material adhesion during cutting. 2 flutes and spiral design of the end mill router bits facilitate the smooth discharge of chips and avoid blockage during cutting. Precision cutting edges ensure clean and accurate cutting. The up cut spiral router bit is suitable for side milling, finishing, grooving, stamping, engraving and other processing of cork, hardwood, plywood, laminate, oak, MDF, etc. Can be used with cnc routers and handheld routers, etc. Note: Be careful to avoid excessive and too fast feeding. It is recommended to use suitable coolant or lubricant during use to dissipate heat and extend tool life.