Threaded inserts or rivet nut kits contain an assortment of threaded nuts, conversion kits and an installation tool. AVK threaded inserts come in several style: A-L steel yellow zinc, A-L aluminum, A-K steel yellow zinc, and A-T steel zinc. Each kits contains 170 to 270 inserts, in 8 to 12 different sizes. Threaded insert kits are available at Advance Components https://www.advancecomponents.com/tools-installation-kits/threaded-insert-kits/ and are in-stock for same day shipping.