A
snap fastener (also called
press stud,
popper,
snap or
tich) is a pair of interlocking discs, made out of a metal or plastic, commonly used in place of
buttons to fasten
clothing and for similar purposes. A circular lip under one disc fits into a groove on the top of the other, holding them fast until a certain amount of force is applied. Different types of snaps can be attached to fabric or leather by
riveting with a punch and die set specific to the type of rivet snaps used (striking the punch with a hammer to splay the tail), sewing, or plying with special snap pliers.