HIRST ARTS MOLD #277 - LARGE GRATE   - "These 1.5" square tiles include grates and diamond plate tiles which can be used for service areas and engine room floors." Skullcrafts only uses gray Merlins Magic to produce top quality castings of Hirst Arts molds. Great care goes into each and every cast to ensure that all bricks are bubble free and all the same sizes. Alternately, you can directly buy Mold #277 from Hirst Arts to cast your own large grate blocks and order Merlins Magic from Clint Sales and Mfg. Skullcrafts is a fully licensed legal seller of Hirst Arts casts, kits and assembled & painted pieces.