Specification Brand : SAFYY BulletPoint1 : High Quality Material:Our square hole drill bits are made of high carbon steel and undergo heat treatment. The drill bits have high hardness, sharp square chisels, and long service life. BulletPoint2 : Helpful:The woodworking square hole drill bit is equipped with a long drill core and a square chisel, which is easy to lock the hole onto the wood and quickly obtain different mortises, greatly reducing the labor intensity of workers and accelerating construction speed. BulletPoint3 : Easy to Use:It can be used in conjunction with professional equipment square hole drilling machines.Convenient and fast. BulletPoint4 : Application:This woodworking chisel bit is suitable for drilling square holes in wood using mortise machines, mortise attachments, and desktop drills. BulletPoint5 : Purchase Note:Please confirm the size before purchasing CuttingAngleString : 135 degrees ExternallyAssignedProductIdentifier1 : 0700667468198 ExternallyAssignedProductIdentifier2 : 700667468198 FinishType : Finished GpsrSafetyAttestation : 1 IncludedComponents : no component ItemName : Square Hole Drill Bits Woodworking Square Drill Bits Set,SAFYY Wood Mortising Chisel Countersink Bits,Sharp Hardness Durable Steel Square Hole Drill Bits Set for Woodworking-18mm ItemPackageDimensions_Height : 0.39 inches ItemPackageDimensions_Length : 5.43 inches ItemPackageDimensions_Width : 0.71 inches ItemPackageQuantity : 1 ItemTypeKeyword : countersink-bits Manufacturer : SAFYY Material : High Carbon Steel ModelNumber : 58S-13 NumberOfFlutes : 2 NumberOfItems : 1 PartNumber : 00994SI ProductDescription : Specification: Material: High carbon steel Aperture: 18mm Shank diameter: 19mm Drill core handle diameter: 12.5mm Effective drilling depth: 75mm Shell handle length: 39mm Total length of drilling core: 210mm Total length of shell: 138mm Weight: 300g