Gegong Cobalt Step Drill Set 5Pcs HSS Hardened Coating Hex Shank Bits Hole Cutters with Aluminum Case

Features:This 5-piece cobalt step drill set features hardened coated HSS construction for superior wear resistance. The hex shank design provides maximum torque transmission and prevents bit slippage. Engineered with precision-ground flutes, it delivers smooth cutting action on steel, wood, plastics and non-ferrous metals while reducing heat buildup. Each drill automatically deburrs holes during operation. Encased in a protective padded aluminum storage case, the set includes five versatile bits covering hole sizes from 1/8 to 1-3/8. Ideal for professional tradespeople and DIY enthusiasts requiring efficient multi-stage hole enlargement.Sizes:#1: 3/16 to 1/2 6 Steps (3/16'', 1/4'', 5/16, 3/8'', 7/16'', 1/2'')#2: 1/8 to 1/2 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: 1/4 to 3/4'' 9 Steps (1/4'', 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4)#4: 1/4 to 1-3/8' 10 Steps (1/4'', 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8)#5: 3/16 to 7/8 12 Steps (1/4'', 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8)Package included:1 x 1/4-1-3/8 Step Drill1 x 3/16-7/8 Step Drill1 x 1/4-3/4 Step Drill1 x 1/8-1/2 Step Drill1 x 3/16-1/2 Step Drill1 x Aluminum Box

• [MATERIAL] Premium cobalt HSS with hardened surface treatment, extreme hardness and heat tolerance
• [DESIGN] Hexagonal shank for secure grip in drill chucks, prevents slippage during operation
• [VERSATILITY] Cuts multiple materials: steel, brass alloys, wood, plastics, composites
• [PERFORMANCE] Advanced fluting reduces friction, enables cooler cutting and automatic deburring
• [DURABILITY] Robust construction ensures extended lifespan under heavy duty applications