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RPE rock bolt A rock bolt is a type of anchor bolt used for preventing collapse of the inner wall of an excavated tunnel. HK-500 The HK-500 is a seam-fitted folded plate. Thanks to its unique seam structure and fitting rib which eliminate the need for cleats, this product features superior workability while maintaining high wind resistance. Examples of processed products This page shows an example ofa product made of ZAM™.