🔩 IRWIN 91140 8 Inch Silver Deming: Premium Quality Industrial Drill Bit with Precision and Power Review

Stays sharp, cuts through the cast iron chain mount on my Jeep TJ frame. My wife dripped a few drops of oil on it about every minute and I drilled slowly and carefully. (The drill bit in my Makita LXT211 combo kit has two speed settings. One for 0-400 RPM and one for 0-1500 RPM. I ran it on low speed about halfway through, which felt a bit too gentle Eventually I stopped on the trigger, cranked it up to 400rpm and used medium pressure with a few drops of oil about every 30 seconds Works well…

I needed a drill bit to cut two 5/8" holes in 3/8" farm tool steel and I got it from Revain found a good price. It worked better than I expected. The IRWIN bit is made of M-7 high speed steel for durability. It arrived sharp and in its own storage box. I set the recommended drill speed for a 5/8" drill bit diameter and material (steel) as closely as possible according to the chart on my drill press. You can also download a PDF chart from the IRWIN website that lists the angle of the drill. Bit…

> Although the drill is nominally 12 inches long, it would be more accurate to describe it as 2 3/4 inches long plus a 9 1/4 shank. Other long drill bits I've bought from other manufacturers were about 9" long with a 3" shank. To drill a 6" deep hole with a 9" twist drill bit, you must clean the spirals at least once (to minimize the possibility of jamming, especially on hard or wet wood). But with the Irwin 62116 you have to broach deep holes much more frequently, about every 1 inch, and…