5 pcs Titanium Step Drill Bits Set & Automatic Center Punch - High-Speed Metal Steel Drill Double Side, Hss Cobalt Multiple Hole 50 Sizes with Aluminum Case

Description

SUPPLIM HOME 6 Pcs Step Drill Bit Set with Center Punch The professional manufacturer of titanium cobalt drill bits, countersink drill bits, spade drill bits and kinds of cutting tools. About our products. 1：High speed steel along with the titanium coating 2：This one set replaces 50 individual drill sets. Comprised of high quality, long life high speed steel. 3：Self starting - no need for a pilot hole. Cobalt coated to reduce friction and run at cooler temperature. 4：Automatically deburrs holes as you drill. 5：135° SPLIT POINT TIP AND TWO-FLUTE DESIGN: increases cutting speed with self-centering and prevents walking, clears chips faster and allows particles to escape easily. 6：Automatic center punch for marking accurate spot makes you drill easier and save more effort. Size Include: #1: 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") #2: 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") #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: 1/8" 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'') #5: 3/16" to 1/2" 6 Steps (3/16'', 1/4'', 5/16", 3/8'', 7/16'', 1/2'') Please Note: It is recommended to apply oil to the drill bit before each use. Check the concentricity of the spindle and spring chuck and the clamping force of spring chuck. For the concentricity may cause the drill bit broken and make drill hole too large.