NORTOOLS 91 PCS HSS M35 Cobalt 5% Fully Ground Drills DIN338 with 135°Split Point for Sheet Metals Plastic 1.0-10.0 x 0.1mm

High Quality drills for all types of jobs and stay sharp

OK

These drill bits have been purchased specifically to drill out stainless steel pins on an aluminium mast . I tested one bit to see how sharp they are . Yes they are very sharp. Not tested re how many times the bit can be used before needing resharpening but by the sharpness after just one quite prolonged drill I would imagine a fair number of times . The only downside is quite a lot of the drill bits are very tight in their slots and to avoid cutting one’s fingers ( which I did ) I would suggest the use of a cloth around the bit to be removed and that bits are cleaned of their protective coat and maybe sprayed with WD 40 or similar to make easier removal . Apart from that the case is is nice and strong albeit a form of plastic instead of metal which might be better . All in all a good product for the price but as I said I have not tested how many times these bits can be used before needing resharpening.

These drill bits are great on stainless steel just be aware that with the addition of 5% Cobalt that they tend to be a little more brittle than the usual HSS drill bits. They drill stainless very well providing they are not forced into the workpiece - let the drill do the work. Better to use with some form of coolant/lubrication too.

All the bits you need

Used for drilling 316 stainless and aluminium alloy. Pretty effortless.

first drill first piloted hole drill broke not even half way through

These drill bits will not cut stainless steel as the material quality is too poor.