Entrance mats from the HD40xx series are especially developed for entrance areas with heavy to extreme traffic – office buildings, hospitals, supermarkets, shopping malls, etc. They are all closed-type entrance mats. The dirt is trapped in special grooves between the profiles, where it can be easily vacuumed or swept off. All the mats from the HD4017 series are fully compatible with the mats from the HD6017 series ( the individual profiles of the HD4017 and HD6017 can be assembled together). The difference between HD60xx and HD40xx is that the HD40xx uses standard size inserts, including a standard triple brush. Our HD40xx mats are made to order, in 3 to 5 business days, your mat will be produced and delivered. The warranty for all entrance mats from HD40xx series is 5 (five) years.