Andrus Electric 12 Volt Sharpener.

Uses 12-volt D/C motor with battery cables
Also available without motor for $220.00
Price includes one 4" diameter flat emory wheel with 1/2" bore, for use on steel teeth, additional wheels available for $15.00

Diamond wheel for carbide $100.00 with 1/4" [4/16] Thick Diamond; not like most who offer only 1/16".