Specification Brand : Rannb BulletPoint1 : Material-The pilot drill bits are made of tough steel and the shanks are made of carbon steel. BulletPoint2 : Features-Pins lock the saw to prevent over tightening and prevent Threads from Stripping. BulletPoint3 : Dimension-Hex Size: 7/16" ;Thread Dia:15.5mm/0.61";Dill Bit Head Dia:6mm/0.236" BulletPoint4 : Please Note-Please keep safe when operate the drilling work. it is better firstly slow speed,then higher. wear safety glasses it important for safe of eyes. BulletPoint5 : Package Content-1pcs x Quickchange Arbor Color : Black CompatibleMaterial1 : Wood CompatibleMaterial2 : Metal GpsrSafetyAttestation : 1 ItemName : Rannb Hole Saw Mandrel 7/16" Hex Shank Arbor with Pilot Drill bit ItemPackageDimensions_Height : 10.6934 centimeters ItemPackageDimensions_Length : 3.9878 centimeters ItemPackageDimensions_Width : 7.1882 centimeters ItemTypeKeyword : hole-saw-arbors Manufacturer : Rannb Material : Tough Steel (Pilot Drill Bits), Carbon (Shanks) ModelNumber : wby2618 PartNumber : wby2618 ProductDescription : Dimension Hex Size: 7/16" Thread Dia:15.5mm/0.61" Dill Bit Head Dia:6mm/0.236"