![]() Excellent and they save a lot of frustration. So, bottom line is that if you are drilling SS then buy these. I am being very careful to use cutting oil and a pillar drill but even so I'm impressed. So far non of the drill bits have broken or worn in any way despite having been used quite a bit over the last three weeks. For that reason I did wonder if they would be any good but I'm happy to report that they are proper quality. I remember years ago buying some cobalt drills for a ship I was on and each bit cost more than this box load. And despite the very reasonable price they are bloody brilliant. So rather than mess around I got these cobalt drill bits which I have very carefully preserved for my stainless steel drilling. Unless you can get the speed just right, along with plenty of cooling and lubrication it is inevitable that very quickly you will put a bit of heat into the SS and thereafter the chances of cutting through it with standard twist drills drops to zero. To learn more about how and for what purposes Amazon uses personal information (such as Amazon Store order history), please visit our Privacy Notice.īought because I have a load of holes to drill in stainless steel and frankly HSS drill bits are of little use and even the Ti-coated ones not much better. HSS Cobalt Split Point Fully Ground Drill Bit Set 19pc Metric AK4701 Sealey Ne. The cobalt blend improves resistance to heat and abrasions for increased strength and long life. You can change your choices at any time by visiting Cookie Preferences, as described in the Cookie Notice. The KANGO 19PC Cobalt Drill Bit Set includes 19 bits ranging from 1mm to 10mm. ![]() ![]() Click ‘Continue without accepting’ or ‘Customise Cookies’ to decline these cookies, make more detailed choices or learn more. Third parties use cookies for the purposes of displaying and measuring personalised advertisements, generating audience insights, and developing and improving products. This includes using first- and third-party cookies which store or access standard device information such as a unique identifier. If you agree, we will also use cookies to complement your shopping experience across Amazon stores as described in our Cookie Notice. We also use these cookies to understand how customers use our services (for example, by measuring site visits) so we can make improvements. Do not buy.We use cookies and similar tools that are necessary to enable you to make purchases, to enhance your shopping experiences, and to provide our services, as detailed in our Cookie Notice. Just glad I tried them out first before starting on an expensive piece of stainless.Ī waste of money. I suppose at my age I should have known better than to purchase a set of Cobalt drills for £25 when well-known brands were going for twice the price. The case may be metal but here is gaping hole in the top (so you can see there are drills inside?) which allows the smaller drills to come out unle ss a great deal of care is taken during transport. So I can only conclude that these are very poor quality or there is a manufacturing fault. ![]() Yes, I may have bent one or two but never snapped any but the smallest diameters. 135° Split point tip enables bits to bite workpiece quickly, reducing the need for centre mark. I have never in my life snapped drills of this size (I've been using drills for more than 40 years) - Fully ground HSS with 5 Cobalt makes these ideal for drilling extra hard materials. To my astonishment, both drills snapped where the plain shank meets the fluting. I was using a DeWalt cordless drill and controlling the speed and feed carefully. Tried 5.5 mm and 6 mm diameters to enlarge a pilot hole through a piece of bronze only 12 mm thick. Bought this set primarily for drilling Stainless Steel but thought I'd try them out on something easier first.
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