Camel Grinding Wheels' semi-flex discs, composed of stiff phenolic resin fiberglass backing, can withstand heavier use than plastic or vulcanized fiber backings typical of other grinding discs. The result is more control when grinding corners and edges. The new backing material also allows the disc to be used without a back-up pad for ease of use and cost savings. Will not deform due to use, heat or humidity ensuring unlimited storage life is possible. The discs can be used wet or dry and are available in 16-, 24- and 36-grit sizes, type 27 shape and in 4-1/2-, 5- and 7" diameters with 7/8" or 5/8"-11 arbor holes.