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* 1.0" hole size. * Spacers for smaller size holes available. * The diamond disk in 140 grit is a medium-fine grit diamond used for small surface area grinding and as an intermediate step from a rougher diamond to a finer diamond on larger surface areas. Disks are magnet backed for easy application and removal on lap grinder metal wheel heads. * Electroplated on fiberboard substrate with copper laminate for rust-free operation over the lifespan of the disk * Manufactured in U S A by a major manufacturer.
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