I make a lot of pine garden furniture and prior to the purchase of this countersinking bit, I was drilling then using a separate countersink to accommodate the heads of stainless screws. This is followed by hiding the screw heads with builder's bog, a very time-consuming activity. Now the new bit exacts a clean 5mm deep, 8mm hole, easily taking a dowel plug which is easily sanding flush. The end finish is faultless, a great tool for all woodwork fans.