Rattle Mounts Standard Rattle Mount without Mounting Bracket. S&W P/N Max Load (lbs) Thread (A) Base Dia (B) Thread Length (C) Min Install Height RESW-1Z 300 5/16-18 1-3/4″ 1-3/4″ 2″ RESW-1ELZ 500 3/8-16 1-3/4″ 1-1/2″ 1-3/4″ RESW-2Z 500 3/8-16 1-3/4″ 2″ 2-1/4″ RESW-3Z 500 3/8-16 1-3/4″ 3″ 3-1/4″