EOTech, a division of L-3, delivers cutting edge technology and products in the fields of holographic sighting systems, tactical lasers, illuminators and thermal imaging equipment. EOTech provides high-quality battle-tested products to law enforcement and commercial markets around the world. The Battery Compartment Repair Kit services worn or oxidized battery compartment springs and rubber grommet for EOTech 512/552 Holographic Weapon Sights. This kit is only for Model 512 and 552 sights manufactured prior to January of 2009. NOTE: Inspect the silver ‘dog bone’ contacts inside the battery cap. If the ‘dog bone’ is missing or corroded, the battery cap is not serviceable and must be replaced.