The Irwin Blue Groove flat bit is one of the best flat bits we have used. The grooves, or parablic curves, not only help clear the hole as you are drilling timber, they positively throw the cuttngs out! The result is that the hole stays clear and the drill bit does not have to overwork by cutting through timber it has already cut through. This reduces the burning associated with flat bits to an absolute minimum and gives a good clean hole. You can buy these bits in our DIY Superstore at http://www.diydoctor.org.uk/DIY-superstore/drill-bits-holesaws/drill-bits-wood/flat-bits/4x-blue-groove-flat-bit-set-of-6.html
