On 2009-12-26 B. Stenman, wrote: Irwin makes both Speedbor auger bits and Speedbor spade bits. The pictures are for a auger bit but the description states that these are spade bits. Big difference between the performance of the two types.
As noted the Irwin Speedbor bits die if they hit a nail. Better if is this is a concern to use one of the Greenlee Nail Eater auger bits. 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. Big gullet hole cutters also require a less powerful drill - important if drilling through very hard wood like oak or ipe.
Irwin auger and spade bits like these also have relatively short shanks which limits their use. 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.
. And summed up by saying incorrect product description. Currently Irwin Industrial Tools 3041006 Speebor Max Spade Bit Set, 6-Piece has an overall rating of 8 over 10.
Irwin Industrial Tools 3041006 Speebor Max Spade Bit Set, 6-Piece can also be found in the following searches:
IRWIN claimed Tri-Flute design allows for faster chip ejection, making this woodboring bit the fastest Speedbor bit ever! Max Life cutting spurs have 3 cutting edges for added durability. Grooved hex shank prevents slipping in drill chuck or bit extension (fits all standard 1/4in. quick-change chucks). Max Ease full screw tip allows bit to self feed.
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