E-Z Fix (E-Z LOK) Inserts are a solid style threaded insert made from either carbon or stainless steel. These inserts come in several varieties, including metric and American in thin wall, heavy duty, or extra heavy duty. There are also inserts with American to metric threads, or metric to American threads. E-Z Fix inserts are very easy to install, partially due to the fact that they only use standard drills and taps, no special tooling is required. During installation, the adhesive in the exterior threads is activated, strongly locking the inserts into place.