Single Insert, #256 UNC, 1D, Stainless Steel Screw Locking Insert HELI-COILNOTE: ITEM MUST BE ORDERED IN MULTIPLES OF 100. TOTAL RECYCLED CONTENT: 10.00%. POSTCONSUMER RECYCLED CONTENT: 1.00%. CATEGORIES: Maintenance, Repair and Operational (MRO) Supplies. Thread Repair & Reinforcement. Threaded Inserts. Helical Inserts. ScrewLocking Inserts. KEYWORDS: HeliCoilThread Repair & ReinforcementThreaded InsertsHelical InsertsScrewLocking Inserts.