In this Part -
"abrasive wheel" means - (a) a wheel, cylinder, disc or cone which, whether or not any other material is comprised in it, consists of abrasive particles held together by bonds, (b) a mounted wheel or point and a wheel or disc having (in either case) separate segments of abrasive material, (c) a wheel or disc made (in either case) of metal, wood, cloth, felt, rubber or paper and having any surface consisting wholly or partly of abrasive material, or (d) a wheel, disc or saw to which a rim or segments consisting of diamond abrasive particles are attached, which is, or is intended to be, power-driven and is for use in any grinding or cutting operation;
"mounted wheel or point" means a wheel or point consisting (in either case) of abrasive particles held together by mineral, metallic or organic bonds, whether natural or artificial, and securely and permanently mounted on the end of a mandrel or quill.