Features: 100% quality and Brand new. No need for a pilot hole.Titanium coated to reduce friction and run cooler. Made from high quality stainless steel material, hardness and durable enough. Special step structure, can drill different size holes. Fluted edges for faster, smoother cutting. Comes with 5 different sizes for all needs. Working with water cooling, can effectively extend the service life of bit. Has 3-sided shank to prevent slip in drill chuck. Specification: 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") Length: 1/4--1-3/8" Length: 7.6cm 3/16--7/8" Length: 7.8cm 1/4--3/4" Length: 7.2cm 3/16--1/2" Length: 5.7cm 1/8--1/2" Length: 7.6cm Package included: 5 x Step Drills
