We sell several types of Diamond Hones.
The Mini Hones have a plastic handle with a 3/4" wide by 2-1/2" continuous diamond area on one end.
The Credit Card Hones are very thin with a continuous diamond area that measure 3.25" by 2" by .05" thick.
The 70mm Diamond Stones have a diamond area the has a grid of recessed holes mounted on a plastic backing. Each one measures 2-3/4" by 1" wide by 3/16" thick.