4-Way Heavy Duty Enduramat CouplerIf you are need of a more substantial way of keeping your Enduramats together then the 4 way coupler is the product you need. The standard Enduramat coupler works well for light applications but for heavy duty applications nothing keeps the Enduramat locked down like the 4 Way coupler does. The Heavy Duty coupler fixes through any of the Enduramats locking holes. The coupler consists of 4 x M12 studs and two heavy duty steel plates The mats are