This auction is for FOUR rotary diamond bits - choose the size and grit you need or combination.

I am looking for chain pitch OR the diameter of the file used - (3/8" pitch and 1/4" pitch = 5/32" diameter or 4mm diameter), (.325 pitch and 3/8" pitch = 3/16" dia or 4.8mm dia), (7/16" pitch and .404 pitch = 7/32" dia or 5.5mm dia).

Any of the above numbers will tell me what you have. Choose 150 grit (smooth) or 80 grit (rough).

I have been selling these for over 8 years with only a couple of grumbles. Not everyone is good with tools

These amazing sharpeners are for sharpening chains whilst still on the bar. I have a rotary bit 3 years & still cutting, although it looks like an hourglass

Rotary bits will fit Oregon, Dremel, air die grinders and similar, even a fast electric/cordless drill.

Special micron grade diamonds will out-last stones and steel files. Also MUCH better on the new hardened or carbide chain teeth.

Rotary bits are 45mm long with a 20mm cutting head. The shank is 3mm in diameter to fit the smaller collet or any chuck

I have used steel files and grinding machines for chains but until you try one of these you won't know what sharp is

Also - a grinder removes a lot of metal reducing the life of the chain. Steel files clog up & corrode easily

Rotary bits are amazing. It's easy to hold them steady & at the right angle - they also don't remove as much tooth as a grinder

The rough is used on really blunt or chipped teeth or in a slower tool.

Bigger and better photos of this & other stuff on my web site here - please cut & paste into your browser:

http://www.itemdetails.info/?page_id=98

I sell a 12volt grinder for these on TM - photos & video here:

http://www.itemdetails.info/knife-and-chainsaw-sharpeners/12v -css-12-volt-chainsaw-sharpener/