Use this RSP Tool Tray with the Runyon Magnetic Preload power trowel polishing system. The MPS system is a wet system, so use these trays to clean off all your tools. Use a separate tray for each tool grit. Depending on if you're running 30, 40 or 60 (3, 4 or 6 tools respectively per plate) per machine, clean each grit in these trays. These clever tool trays are stackable and allow the water to run off the tools and through the bottom slots.