Connect Mat HD is an anti-fatigue mat manufactured from a hard wearing rubber compound. Modular drainage mat with one-sided built in connectors, makes it easy to design your own configuration. Easy to connect on any side. Nib backing elevates mat above surface for improved drainage. Interconnect can be positioned to cover large flooring areas, single workstations and assembly lines. There are 3 types of these kind of mats, depending on the application: GR-Grease Resistant mat are for Water or dry debris. CFR- Cutting Fluid Resistant are for Mineral oil-based fluids. NBR- Nitrile Based Rubber which is best used for Petroleum-based fluids. For extra safety attach 3′ x 39″ beveled yellow safety edges.