1003 IS A 1.00" X 1.00" FRACTIONAL 10 SERIES SQUARE T-SLOT PROFILE WITH THREE ADJACENT OPEN T-SLOTS, ONE ON THREE 1.00" FACES. THE PROFILE HAS ALIGN-A-GROOVES TO ASSIST IN ALIGNMENT WHEN CONNECTING PROFILES. THE 1003 PROFILE IS COMPATIBLE WITH 10 SERIES FASTENERS. THE THREE OPEN FACES ON THIS PROFILE PROVIDE A CLEAN, AESTHETIC LOOK AND LENDS ITSELF TO WORK SPACES, DISPLAYS OR RETAIL KIOSKS.,