Abrasive wheels of various constructions for marine use in machine working and reconditioning parts. These wheels are generally used for cutting, deburring, blending and cleaning operations, and for surfacing finished hard steel, stainless steel, aluminium, carbon and brass. Abrasive wheels, regardless of the type, are constructed by organic or inorganic bonding methods. 1. Organic Bonded Wheels (Resinoid Bonded Wheel) Organic wheels are wheels which are bonded by means of an organic material such as resin, rubber, shellac or other similar bonding agents. 2. Inorganic Bonded Wheels (Vitrified Bonded Wheels) Inorganic wheels are wheels which are bonded by means of an inorganic material such as clay, glass, porcelain, sodium silicate, magnesium oxychloride, or metal. Wheels bonded with clay, glass, porcelain, or related ceramic materials are characterized as “vitrified bonded wheels.”