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Description: Sizes: #1: 3/16" to 1/2" 6 Steps (3/16'', 1/4'', 5/16", 3/8'', 7/16'', 1/2'') #2: 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") #3: 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") #4: 3/16" to 7/8" 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") #5: 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'') Features: 1.Set includes five standard HSS step drill bits with a two-flute design for faster, smoother cutting 2. Made of super strong HSS steel for added durability and bit life. 3. Suitable for drilling holes in plastic, aluminum, copper, stainless steel and many other types of sheet metal. 4. Drills holes in steel, copper, stainless steel, plastic, aluminum and other thin materials. Specification: Condition:New Material:H.S.S. 4241 Applicable thickness of steel plate:5 mm Package Includes: 5 x Step Drill Bits 1 x Aluminum Case