Description of Drill America Qualtech High Speed Conventional
High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge. Round shanks allow use with a wide variety of toolholding systems. When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. Ideal for production, maintenance or portable drilling jobs.
I ordered 12 3.05mm drills and received three 3.05mm drills; six, 3.50mm; and three 3.15 mm drill bits. Worse, most drill bits of any size marked are at least 0.001 inch (sometimes 0.0025 inch) smaller than the listed size. Of the twelve drills, I only got one 3.05mm drill that was the right size. All of them were in an envelope marked 3.05mm. Obviously the quality of the packaging is poor, but the bigger problem is that most of them are too small. These are low quality drill bits and I…
These bits are absolute rubbish. I assume they are from abroad. I broke 4 bits on about 8 holes. One bit didn't even make it to the full hole. Another bent while drilling. I drilled out a 2x4 and then a 17 gauge standard 2-3/8 inch metal post. Another "K" drill bit I used to use (which I believe was made in America) made at least a hundred holes before I had to replace it because it was dull. These drills never dull because they break long before they dull. If you only drill wood, okay…
These drills are good value for money and the finish and cut appear to be excellent but some of them are mislabeled. The outer packaging was labeled 4.85mm, but the drills themselves were engraved with the number 11, which corresponds to the wire gauge. The difference is 0.19094" vs 0.1910" (4.85mm vs 4.8514mm) so it's probably negligible for most people, but I ordered 4.85mm because I specifically wanted something smaller. #eleven. Also, it has a dividing point and looks like 135 degrees…