CO-Z 5pcs Hss Cobalt Multiple Hole 50 Sizes Step Drill Bit Set with Aluminum Case

Specifications Item Type: Step Drill Size: #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")" Features 1. Cobalt added reduces friction and lasts longer than those which does not contain cobalt bits. 2. High speed steel for longer service life. 3. Double cutting blades design enables a faster and smoother cutting. 4. Automatically deburrs holes while drilling 5. 3-sided shank prevents slip in drill chuck 6. Includes a protective aluminum case to make the drills not easy to dull. 7. The sharpness and titanium coating ensure easily cut through most sheet metal, plastic and of course wood and some other materials with ease. Package 5x Step Drill Bit Set 1x Aluminum Case.