THE 45 SERIES INDUSTRY STANDARD ALUMINUM PROFILE SYSTEM IS GREAT FOR MANY GENERAL-PURPOSE USES. IT CAN USE USED IN LIGHT TO HEAVY DUTY APPLICATIONS AND FEATURES A WIDE VARIETY OF PROFILES INCLUDING, ROUND, MITRE, SMOOTH SIDE AND EVEN STAIR PROFILE. THE STANDARD PROFILES HAVE TIME SAVING FEATURES SUCH AS STANDARDIZED SLOT SIZE, CENTERLINE KNOTCH AND SELF TAPPING END HOLES.