"MUST READ"    The shank of the bit that goes into the drill is round, does not, DOES NOT, have the flat on the shank that the specialty spot weld drills need. This is a very special spot weld cutter not designed for everyday use. It is designed to cut the hardest Boron steels, but is very brittle and they break very easily. They are very expensive and come with no warranty from the manufacturer. This one is made to work in common drills, not the specialty spot weld cutter drills.  The shank of the bit that goes into the drill is round, does not, DOES NOT, have the flat on the shank that the specialty spot weld drills need. To use this cutter you need to run at lower rpm's on a low torque drill with much higher downward pressure than normal. Also, you can not rock the drill side to side when drilling.    THESE BREAK VERY EASLIY BUT WILL CUT THE HARDER STEELS WHEN USED PROPERLY.....

This listing is for 1 new 8 mm Carbide Boron Spot Weld cutters. The shank of the bit that goes into the drill is round, it is for use in common style drills. It does not, DOES NOT, have the flat on the shank that the specialty spot weld drills need. Made in the USA. Some car makers are starting to put very, very, very hard Boron steel in there automobiles. Normal spot weld cutters will not, will not, will not cut these steels. Even this bit can break when trying to cut these steels. This bit is not the one bit to cut all steels. On normal steels you should use the other more common spot weld cutters. In the rare cases that you run into the hard Boron steel, and you must drill it, such as for reusing certain panels. This is the bit for the job. The best thing to do with boron steel where you can is to grind the welds to cut them. We understand that some welds must be drilled. Again these bits are the only ones able to do these hardest steels. They are very, very, very expensive, and can break easily, but at times, necessary to get a very difficult job done. These are the best money can buy.  But you must control the rpm's keeping them low. It is multi layer coated to add strength to the bit, and 3 fluted.   Due to the nature of drilling these super hard steels, there are no warranties on them. There are many things that factor into the life of these bits, our 100 percent satifaction guarantee is this on  this cutter,  if once you recieve the cutter, you on your inspection are unhappy with it, we will allow it returned for refund only if unused.   DO NOT BUY THIS CUTTER IF YOU DON'T UNDERSTAND OR AGREE TO THIS DESCRIPTION.    We specialize in selling cutting products to Body Shops. We sell only High Quality tested products.  

This is a tungsten carbide drill bit.

Slower the RPM to better. This drill bit carries no warranty."