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4"x4" Rubber Bench Block
ImpressArt 4"x4" Jeweler's Rubber Bench Block. Place this rubber mat under your crystal rivets to avoid cracking them when setting. To use, simply snap the crystal head into the cap, place the crystal face down on the rubber mat, hold the concave end of the rivet setting punch against the cap, and hammer until the rivet is set. Rubber mat designed to protect crystal while setting. Sold individually.