Review on Enhanced Performance and Extended Reach with Bosch BL2635 Extra Length Aircraft by Aaron Ward

I have used this drill bit to drill over 3" diameter holes in wood floors/joists for squeak free wood screws to install. They are strong for a long thin drill bit and will not split or mar hardwood floors. Only the first 2 inches or so of the bit is fluted, so you'll have to pull the bit out every few inches to clear the sawdust, or it will stop drilling because the flutes are clogged.