hook and eye

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A clothes fastener consisting of a small blunt metal hook that is inserted in a corresponding loop or eyelet.
• noun A latch consisting of a hook that is inserted in a screw eye.

from The Century Dictionary.

• noun See hook and eye, under hook.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A matched hook and an eye (loop into which the hook can fit), used for fastening.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a kind of fastener used on clothing