Hah, too late! Already broke the bit on #8 & #10. That's why I'm here. I'm also thinking maybe the countersinks don't have sharp enough edges to cut through hardwood so I'm having to apply more pressure than need be.I wouldn't recommend the Hitachi ones that lowes sells. The countersinks are good but the drill bits are junk. They have a slot that a stopper screw hits for depth adjustment. All of mine broke along the slot and I'm pretty careful not to break drill bits.