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These imported laps are a less expensive alternative to Crystalite standard laps Compare to Crystalite Standard laps These 8" aluminum-backed, electroplated diamond faceting laps are manufactured with the highest quality diamonds that are nickel electroplated uniformly onto a 1mm thick steel plate. This plate is then professionally bound to a 1/4" thick aluminum master lap. Laps have a 1/2" arbor hole.