the establishment is not so easy as that because the screen protector is not quite the right size (missing barely a millimeter) However, provided that the screen is really HYPER CLEAN no bubble is formed which is a huge plus side to conventional protections. Hardly changes the sensitivity of touch (though I knew the G3 "a" is a bit less sensitive) Not sure that really protects the screen of a hammer but since the installation no scratches did not occur. Beware the screen protector tends to keep a little too "fat so it is necessary to clean a little more often.