Last summer while visiting John M. in WI I was impressed by the floor mat system in his shop. I finally found a similar system at sears. The mats are 2'x2' and have a dovetail pattern on the edges so they interlock. The mats have a diamond plate pattern on the surface which makes them aesier to clean. (The shop vac doesn't stick to them as bad). After working on a cement floor for years they are a real treat for the feet.