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Description: Surface treatment: Titanium Material:HSS Size: 1/4" to 1-3/8"(1/4'', 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8") 3/16" to 7/8"(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"(1/4'', 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4") 1/8" to1/2"(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" to1/2"(3/16'', 1/4'', 5/16", 3/8'', 7/16'', 1/2'') package: 5×Step Drill bit 1×Aluminum Case