The protective glass on my Gen 1 Scope Cam was shattered by a heavy BB and this new glass replaced it perfectly. I carefully removed the old broken glass and adhesive, and made sure the lens was undamaged. Once the area was clean I just peeled off the adhesive paper from the replacement glass and presto, it fitted in perfectly. Took 2min to install. Shipping was also super fast via FedEx and arrived sooner than expected in South Aftica. Very happy.