KURSTOL Countersink Drill Bit Set - M35 HSS Cobalt Coated Countersink Drill Bit for Stainless Steel Iron Aluminum Copper, 6pcs 6.3mm-20.5mm Countersink Chamfer Bit Round Shank Fixed On Drills

• 【Pakcage Includes】6pcs M35 HSS Countersink Drill Bit: Diameter 6.3/8.3/10.4/12.4/16.5/20.5mm, Round Shank. Each drill bit is engraved with dimensions so you can easily select the exact bit you need.
• 【M35 High Speed Steel】HSS surface plated with Cobalt treatment, increases hardness, corrosion protection, wear resistance and durability, for longer service life and higher drilling efficiency.
• 【Five Flute Design】Five cutting edges for Fast chip removal and heat dissipation, Fast and smooth drilling.
• 【Multiple Application】Drilling/Countersinking and Chamfering of surfaces of stainless steel (below 2MM), Iron, aluminum, copper and other metals, wood and plastics, etc.; (drilling stainless steel is recommended to slow down the drilling speed) .
• 【High Compatibility】They can be used with hand drills, bench drills and electric drill (If you choose a electric drill, please drill vertically and do not swing from side to side. The drilling feed speed should not be too fast,Recommended 2000-5000 RPM,MAX 5000 RPM). Notice: Only flat drilling mode can be selected, impact and hammering modes cannot be used.

Applicaton: Drilling/Countersinking and Chamfering of surfaces of stainless steel (below 2MM), Iron, aluminum, copper and other metals, wood and plastics, etc.; (drilling stainless steel is recommended to slow down the drilling speed). Features: 1.【Wide range of uses】comprehensive specifications, a variety of sizes, to meet customer demand for processing a variety of materials and different diameters; 2.【2 Functions in 1】Drilling(countersinking hole), chamfering in one step, rich and diverse functions, saving processing steps and processing time; 3.【High versatility and convenience】The product combination can meet your various needs. Each drill bit is engraved with the size, you can easily choose the exact drill bit; 4.【High Quality Raw Material】M35 industrial grade high speed steel, with high hardness, high sharpness, high wear resistance, and extended service life; 5.【Three Edge Design】With three cutting edges, it can achieve the effect of rapid chip removal and heat dissipation, realizing fast drilling; 6.【Surface plating treatment】HSS material is surface plated with Titanium/ Cobalt to improve cutting performance, increase hardness, wear-resistant and durable, corrosion-resistant; 7.【Applicable Machines】Round shank, suitable for most power tools, such as hand drills, electric drills and bench drills. Precautions: 1. Applicable to hand electric drill, bench drill; hand electric drill use should pay attention to the operating techniques, vertical drilling, do not swing from side to side. Drill feed speed should not be too fast, do not press hard / brute force operation, in order to avoid breaking; 2. Continuous drilling is recommended to use cutting oil or water cooling can greatly extend the service life; 3. ONLY choose flat drilling mode! DO NOT use the impact and hammering mode!