Specification Brand : Firearth BulletPoint1 : High Speed Steel M2AL ,M2AL has a hardness of roughly HRC66-HRC68 and a slightly longer lifespan than the M2 material, with longer service life and high heat resistance.3/4" Weldon shank with 2 flats - fits most standard magnetic drill presses; Including pilot pin BulletPoint2 : Widely used in drilling steel, copper, aluminium, stainless steel and plastic, in either plate or pipe form.Size: 9/16" 11/16" 13/16" 15/16" 1-1/16", Cutting Diameter: 2" BulletPoint3 : Annular cutters are compatible with almost all major brands of magnetic drills, can also be used with machine tools such as mills and large drill presses with tool holders. BulletPoint4 : Thin wall design enables faster cutting due to less material to be removed.Dual alternating tooth geometry produces more aggressive cutting and ejects chips more quickly BulletPoint5 : The cutting speed:VC=20-25m/min.The reasonable rotate feed amount shall be fn=0.08-0.13mm/r.The reasonable feed rate shall be vf=36-60mm/min. Color : Silver ItemName : Annular Cutter Set 5Pcs, Cutting Depth: 2" Cutting Diameter 9/16" 11/16" 13/16" 15/16" 1-1/16", HSS Mag Drill Bits Kit for Magnetic Drill ItemPackageQuantity : 1 ItemTypeKeyword : annular-cutters Manufacturer : Firearth Material : High Speed Steel NumberOfItems : 5 PartNumber : DB0255PCS ProductDescription : Specification: Item Type: Morse Taper Drill Chuck Arbor Model: B10/B12/B16 (Optional) Precision: 0.005 mm Rod Diameter: 10mm / 0.39in Movable Rod Length: 90mm / 3.54in