The H-D Retro thumb safety family is the result of years of design and testing to develop a thumb safety that is ergonomically comfortable, rugged in construction and offers unique features that solve many of the problems with existing designs. The Retro thumb safety was developed to answer customer requests for a version of our original thumb safety with a small shelf that looked appropriate on a Classic or Retro 1911.The positioning of the thumb shelf also helps keep the palm of your hand in deeper, more solid contact with the grip safety, so it's less likely that you'll have a failure to get the grip safety depressed and then keep it depressed, which could render your pistol un Mfg: Harrison Design & Consulting