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One of the advantages of a hole saw or big gullet hole cutter is that all the material is not removed and the chance of hitting a hidden nail head is greatly reduced. As noted the Irwin Speedbor bits die if they hit a nail. Irwin auger and spade bits like these also have relatively short shanks which limits their use. The pictures are for a auger bit but the description states that these are spade bits. Better if is this is a concern to use one of the Greenlee Nail Eater auger bits.
There are "installer bits" that can be 30" long or longer and are awkward to use but a few companies are also making 17-18" long auger bits which provide excellent cutting depth and are easier to use than the installer or bell hanger versions. Irwin makes both Speedbor auger bits and Speedbor spade bits. Big difference between the performance of the two types. Big gullet hole cutters also require a less powerful drill - important if drilling through very hard wood like oak or ipe.
Good for drilling softer woods, not too thick. These bits work well for me in my job as an electrician. Good idea to frequently back it out and watch out for nails.
this are great bits bought the same ones at lowes for 19.99 last week. would suggest them to anyone who installs wires through studs and need to get the job done quick.
BOX BROKE THE FIRST DAY. One of the reasons this set appealed to me is the box, I am a neat freak and my tools are all kept clean and organized on the truck.Tried these bits twice so far and found them to be of " Fair quality"Blade tip is very rough. Box hinges are made of extruded plastic and is very thin and brittle.
The self feeding feature pulls the cutting face into the work much too fast for the Bosch to handle. They would probably be good for a corded or more (much it would seem) powerful cordless. I bought these drills for use with the Bosch litheon PS20 cordless drill.The bits seem to be of high quality. It stalls out even with a fresh charge.
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