Specification Brand : OXMUL BulletPoint1 : Total 50Holes / 4PCS Bits / COBALT BIT / HEAVY DUTY for SS / (1/8"-1/2") & (3/16"- 7/8") BulletPoint2 : 【Heavy Duty for Stainless Steel】 The Cobalt Drill Bits(1.3243 STEEL) can drill 6X longer life and 2X faster. This Drill bits is heavy duty for Stainless Steel, Metal, Galvanized Steel, Aluminum,Iron, Wood, PVC and Copper. This steel drill bit is tough,sharp and can drill many holes on hard metal like a Work Horse! BulletPoint3 : 【M35 Cobalt Drill】 Prefect for Stainless Steel/Metal Sheet/Wood/Plastic/Aluminum Sheet/Copper and other metal sheets. This Drill bit can successfully drill more and more holes easily into Stainless Steel plate like knife through butter BulletPoint4 : 【A Work Horse】This spiral shaped step bit is a work horse. Easily drilled through the steel platform of your zero-turn mower, cold rolled steel, lug bolt, old rack, iron rotors, tractor bucket, washer, heavy steel loader bucket was made for a tractor, hydroponics tubing,water pipe, cabinet BulletPoint5 : 【Total 50 Holes︱2-Flute】2-Flutes:Strong and no-break; Clears Chips faster.Total 50 Sizes:1/2" Unibit is From 1/8",5/32",3/16",7/32',1/4",9/32",5/16",11/32",3/8",13/32",7/16",15/32" to 1/2 inches, 7/8" Unibit Step Drill Bit is from 3/16", 1/4", 5/16", 3/8", 7/16",1/2", 9/16", 5/8", 11/16", 3/4" 13/16" to 7/8" BulletPoint6 : 【3/8"HEX Shank︱1/4" Hex Shank】 Fits into power tools chuck securely and eliminates slip. 7/8" Step Drill: 3/8" Tri-Flat Shank; 1/2" Unibit:1/4" Hex Shank FinishType : Black Oxide GpsrSafetyAttestation : 1 IncludedComponents : Step Drill Bit ItemName : OXMUL Step Drill Bit for Steel, 4Pcs 1/8 to 7/8 Drill Bit Set, Cobalt Drill Bit, Heavy Duty for Stainless Steel, Metal, Aluminum, Wood, Wood, Total 50-Steps. 4Pcs 4P201_202 ItemPackageDimensions_Height : 9.8044 centimeters ItemPackageDimensions_Length : 6.8072 centimeters ItemPackageDimensions_Width : 7.2898 centimeters ItemTypeKeyword : step-drill-bits Manufacturer : Navigator Hardware Material : Cobalt Steel ModelNumber : 4P201_202 NumberOfFlutes : 2 NumberOfItems : 1 PartNumber : 4P201_202 ProductDescription : Specification: Rank:Industrial Tool Duty: Heavy Duty Packed: 4 PCS Involve:Total 50 Steps 2Pcs1/8"-1/2"(13-step)& 2Pcs 3/16"-7/8"(12-Step) Manufacturer No.: 4P201_202 Material:Cobalt STEEL GRE.1.3243(M35 STEEL) Increments:1/5 inches Shank: 3/8" Tri Shank / 1/4" HEX Shank Flute: 2-Spiral-Flute Apply to:Stainless Steel, Hard Metal, Aluminum,Wood,Copper