The professional underwater photographer won't ever use a sharp tool to remove an O-ring. Camera housings, strobes, video lights, and sync cords are all made from aluminum, plastics or soft chromed brass. This soft tool is made of plastic to eliminate the chance of damaging an O-ring sealing surface. The Sea & Sea O-Ring Removal Tool has multiple pick and wedge surfaces for the gentle insertion of tool under and around O-ring grooves so it won't cause damage to the sealing surface or the O-ring. Tool is bright yellow in color for easy ID and has a corner eyelet for attachment of a lanyard. O-ring tool is a must for the serious photographer, makes a great safe-a-dive-kit item and you should keep one in your camera bag or case.