COMMONLY USED WITH 10 SERIES ALUMINUM EXTRUSION PROFILES. ROLL-IN T-NUTS ALLOWS INSTALLATION ON PROFILE WITH CLOSED ENDS. INSTALL ROLL-IN T-NUTS ANYWHERE ON THE T-SLOT OF AN EXTRUSION PROFILE. NO MACHINING REQUIRED WHEN USING A T-NUT AND A BOLT TO MOUNT CORNER BRACKETS, JOINING PLATES, AND ANCHOR FASTENERS. BALL SPRING POSITIONS THE T-NUT IN THE SLOT. COMPATIBLE WITH 80/20 PART # 3923. T-SLOTTED HARDWARE ESSENTIAL