Hook and Eye Clasp. The hook and eye clasp is a simple hook on one end of the bracelet or necklace and an eye piece on the other end which is usually shaped like a figure eight. Hook and eye clasps work well for both necklaces and bracelets but is typically not as secure as other clasps such as the spring clasp.
A Climberâs Guide to Carabiners. Carabiners are the unsung heroes of the climbing world. They get beat up and save thousands of climbersâ lives day after day, all without the slightest nod of gratitude or appreciation for their ingenious form and function. A carabiner is a loop of metal with a spring-loaded gate that opens and shuts.
Primer - A device used to provide a flame for the purpose of setting fire to a propellant charge. Also called an igniter.. Primers are divided into two types, depending upon the type of ammunition used by the gun: 1) Case and 2) Lock. Case primers, as their name implies, are used for guns firing case ammunition.