You have a Cressi Leonardo/Giotto Dive Computer in a console model and want to use as a wrist mount while vacationing. To convert your console computer to a wrist unit you will need this screw and nut set along with a wrist strap. Or you have a wrist computer and want to carry a spare wrist strap screw and nut incase the one you have breaks. This durable stainless steel screw and nut is easy to install on the computer. Wrist Strap Screw and Nut make a great save-a-dive-kit item. Screws and nuts fit Cressi Leonardo or Giotto Dive Computers.