Combined Center Drill Bit Set 7 Pieces HSS 60 Degree Countersink Lathe Mill Tooling 1.0 1.5 2.0 2.5 3.0 4.0 5.0mm for Positioning and Chamfering of Wood Metal Alloys

Specification: Name: Center Drill Bit Set Material: High Speed Steel ( HSS ) Size: 1.0 1.5 2.0 2.5 3.0 4.0 5.0 (mm) Quantity: 7 Pieces How to use center drill bits? 1. Fix the work piece deep in the Lathe machine to prevent wobbling when rotate 2. Get rid of acid surface before drilling and use oil or proper lubricant to protect the bits 3. A good rule to follow is to go 2/3 deep on the tapered section 4. Stop immediately if the drilling sound is abnormal and fix any problem before resuming 5. Clean the center drill bits before and after drilling, and apply oil to store it properly. 6. stored in a solid storage case. Number 1 and Number 4 are the two most common sizes. • 【Accurate】A 60-Degree Angle center drill is very useful in drilling accurate center holes, 60-degree countersink holes or starter holes for bigger drill bits in metal-working • 【Multiple Sizes】Center drill bit is made of HSS high speed steel, with extremely sharp blade. Including 7 Pieces of Plain Center Drill Bits Set range in size 1.0 1.5 2.0 2.5 3.0 4.0 5.0 to meet different needs • 【Widely Application】work with lathe machines and most electronic drills to drill holes in Steel, Iron, Alum, Carbon Steel, Brass and other tough material ranging from 170HB up to 200HB • 【Spiral Flute】Spiral groove helps clear chips and debris away from the bit, decreasing friction and heat for a faster, cooler drilling process. The precision ground surface is corrosion resistance to achieve better using effects and prolong the wor • 【Function】Used for precise positioning prefabricated in hole processing and guide the twist drill for hole machining to reduce errors.