Specification Brand : Yosoo BulletPoint1 : Professional Design:The center punch delivers an automatic,high-impact,spring-loaded strike through adjusting the ; its brass body has a deeply knurled for nonslip control; and the carbide tipped bit makes the center punch 10 times stronger than normal one;protective aluminum case makes the drills not easy to dull. BulletPoint2 : 5Pcs Set Include:Includes five standard step drill bits with center punch,which can replace 50 individual drill bits, you can process 50 different kinds of diameter holes with the five pieces. BulletPoint3 : Widely Application: for home repairs and light jobs such as drilling holes in plastic, aluminum, copper, iron sheet and many other types of sheet metal (excluding steel or any other harder metal) BulletPoint4 : Stable and Smooth Cutting :Automatically deburrs holes as you drill. Two-flute design enables a faster, more stable and smoother cutting. BulletPoint5 : Made of Hss Steel Material:Made of super strong HSS steel and coated with cobalt,step drills are more and have better heat Color : Gold ExternallyAssignedProductIdentifier : 6253237871064 ExternallyAssignedProductIdentifier1 : 736077820301 ExternallyAssignedProductIdentifier2 : 0736077820301 FinishType : Titanium ItemDisplayDimensions_Length : 0.39 inches ItemDisplayWeight : 0.05 pounds ItemName : 5 Pcs Step Drill Bits Set, Multiple Hole 50 High Steel Sizes Step Drill Bit Tool Set W/Aluminum Case ItemPackageDimensions_Height : 15.8 centimeters ItemPackageDimensions_Length : 1 centimeters ItemPackageDimensions_Width : 11.7 centimeters ItemPackageQuantity : 1 ItemShape : Wheel ItemTypeKeyword : step-drill-bits Manufacturer : Yosoo Material : High Speed Steel Material1 : Stainless Steel Material2 : Carbide Material3 : Carbon Steel Material4 : High Speed Steel Material5 : Alloy Steel ModelNumber : JIEZEE237871064 NumberOfFlutes : 2 PartNumber : JIEZEE237871064 ProductDescription : Specifications: 3/16'' to 7/8'' Drill Bit: 12 Steps (3/16'', 1/4'', 5/16'', 3/8'', 7/16'', 1/2'', 9/16'', 5/8'', 11/16'', 3/4'', 13/16'', 7/8''). 1/4'' to 3/4'' Drill Bit: 9 Steps (1/4'', 5/16'', 3/8'', 7/16'', 1/2'', 9/16'', 5/8'', 11/16'', 3/4''). 1/8'' to 1/2'' Drill Bit: 13 Steps (1/8'', 5/32'', 3/16'', 7/32'', 1/4'', 9/32'', 5/16'', 11/32'', 3/8'', 13/32'', 7/16'', 15/32'', 1/2''). 3/16'' to 1/2'' Drill Bit: 6 Steps (3/16'', 1/4'', 5/16'', 3/8'', 7/16'', 1/2''). Aluminum Case Dimension: 6'' x 4'' x 1 1/2'' Features: This set replaces 50 individual drill sets. Made by Long life high steel. Self starting no need for a hole. Cobalt coated to reduce friction and run cooler. Automatically deburrs holes as you drill. Includes protective padded aluminum case. Package Includes: 5 x Drill Bits. 1 x Aluminum Case.