I need to find 36" or longer drill bits in 1/2" diameter for drilling across (from edge to edge of) bench tops made of 3" - 4" timbers splined together. I need a bit that will not flex the way I have found auger bits flex when long lengths. Ideally a solid shank with about 10" of flute at the cutting end would be less likely to flex. I have had a problem recently with one of these bits breaking (in two places at once) while drilling through fir timbers.