20 TPI, External Thread, UN Standard, 21E MT7 Grade Thread Mill Insert CARMEXNOTE: ITEM MUST BE ORDERED IN MULTIPLES OF 5. TOTAL RECYCLED CONTENT: 10.00%. POSTCONSUMER RECYCLED CONTENT: 1.00%. CATEGORIES: Maintenance, Repair and Operational (MRO) Supplies. Indexable Inserts. Threading & Thread Mill Inserts. N/A. KEYWORDS: CarmexIndexable InsertsThreading & Thread Mill InsertsThread Mill InsertsN/A.