40-8020-BLACK-FB IS A 80MM X 20MM METRIC 40 SERIES RECTANGULAR T-SLOT PROFILE WITH TWO ADJACENT OPEN T-SLOTS, TWO ON ONE 80MM FACE. THE PROFILE IS SMOOTH, WHICH MAKES IT RESISTANT TO DIRT AND DEBRIS BUILDUP WHILE ALSO BEING EASY TO CLEAN. THE 40-8020-BLACK-FB PROFILE IS COMPATIBLE WITH 40 SERIES FASTENERS. IT IS A THINNER PROFILE THAT CONNECTS EASILY TO FLAT SURFACES AND WORKS WELL AS A SUPPORTING STRUCTURE OR SPACER FOR MOUNTING ACCESSORIES SUCH AS HANDLES, DOOR TRACKS, RAILS, VALVES OR SENSORS.,