The lens protector cover your weapon mounted lights Bezel from carbon build up.The opaque protective cover can prevent light from leaking out and lens damage The inner diameter of each lens protective cover is different, and it is suitable for different flashlights. Please read the description on the details page carefully before purchasing Due to the principle of thermal expansion and cold contraction of rubber materials, installation may require more force, which is normal LP25 diameter size 25mm (0.98inch),LP28 diameter size 28mm (1.1inch),LP30 diameter size 30mm (1.18inch),LP33 diameter size 33mm (1.29inch),LP44 diameter size 44mm (1.73inch),LP57 diameter size 57mm (2.24inch) Flashlight Lens Protective Cover ,Sealed Opaque For Streamlight , Surefire,Weapon lights or Flashlights