Patent ID: 7021997

Claim:
A whetstone having a fish shape comprising: a handle comprising a recessed portion in its tail, a seat in the recessed portion, a disk-shaped cutter rotatably secured to the seat and having a rear portion slightly projected from the tail, a plurality of top slits having different width, and a magnet fitted in its bottom and adapted to attract a fixed member for mounting the whetstone thereon; a head consisting of a first portion integrally formed with the handle and a second portion detachably secured to the first portion, the head comprising an open mouth including a curved recess for gripping a sheet of paper, two slots each in an inner wall of either the first or the second portion, a bottom opening with the slots on its both sides, two abrasive blades anchored in the slots respectively, two projecting eyes on both sides of the head, and a top cavity proximate the handle; and a guide comprising a central yoke matingly received in the cavity, two holes on both sides of the cavity snappingly put on the eyes for fastening the guide, and two wings extended outwardly from both sides of the yoke, wherein: in a first operation blunt cutting edges of a blade of a knife are placed in the opening and are adapted to rub against either abrasive blade to-and-fro repeatedly; and in a second operation a piece of glass is cut along a predetermined line by manipulating the cutter, a portion of the glass is inserted into one conformed slit with the predetermined line aligned with an opening of the slit, and the handle is adapted to pivot to break the glass into two parts.