mbelfer,

The depth of the 60 degree side is .140". But a straight edge across the roller perimeter to the bit tip will be as accurate as the setting tool. That would match the frame angle. Then; more = sharper tip angle; less = less tip angle. And, as you 'grind' the tip, the less the angle becomes.

Keep the land of the bit on the axis of the rollers and tool, and as you sharpen and check the tip you will see a lagging angle of the land. The keeness of the very tip of the bit is dependent on the setting of the bit lands. Be careful of sharpening a bit backwards...or with the lead of the land receding from the straight land edge. That is a common mistake even with professional sharpeners such as Darex with a slipped cam and is easily overlooked. Drilling stainless with one of these will bring out the carbide to correct!

Also, a tiny amount of lapping oil or grinding oil will make the job go much faster and keep the stone from clogging with Chinese steel (if those bits have such a pedigree). There are diamond 'stones' of various grits that will sharpen a bit (carbide included) very quickly.

Yes, a double ended or multi set tool would be very handy. Keep in mind that the collet chuck does not need to be very tight at all. You will not need much pressure when honing the tip and only tight enough to prevent slipping down into the collet is all that is necessary, and it is much easier to reset the bit as it is ground. The beauty is that both sides will be at the exact same angle and making them equal is the only concern. You'll see as you sharpen a few - it's so simply easy and such a very efficient little tool.

Bill C