The CDM Gear patent pending Delta Wave safety was created to give you a little more reach and control when activating the safety on your Mossberg 500, 590A1, 930SPX and others. By creating a second contact and control point closer to the operator, the safety can be rocked on and off more easily without excessive reach or even taking your thumb off the safety. An aggressive ,wide and deep serration assures grip and control while the wide, curved rear deck increases contact awareness in questionable situations. This gives hunters, 3 gunners, security professionals and everyone else increased control in cold/wet conditions or when wearing gloves. Works with 12 ga. and 20ga. Mossberg shotguns with a top mounted safety. Includes wrench and screw with self sealing thread locker. USA Made!