hollow walls. The molly bolt includes an anchor plug and a screw with sides that spread out behind the wall to hold it in place. Home Improvement Glossary mortar Mortar is the bonding mixture that is used to cement bricks and stones together. Home Improvement Glossary mortise A mortise is a shallow recess in a wood frame to seat a piece of hardware flush with the wood. Home Improvement Glossary mounting strap The metal brace that lays across a ceiling box and to which you mount a fixture base. Home Improvement Glossary multiple drop match A multiple drop match is the most complex pattern match. It can take four or more strips to repeat the vertical design. A good example of this is a dense paisley pattern. Home Improvement Glossary nail set A short tool with a blunt pointed tip that is used for pushing the head of a nail or brad into wood. Home Improvement Glossary nap Low- to high-pile carpets have a nap. You have to put the patch in so that the nap runs in the same direction; otherwise, it will look different from the rest of the carpet. Home Improvement Glossary National Electric Code NEC The NEC is the legally defined code that determines how electricity and electrical fixtures need to be used to ensure safety. Home Improvement Glossary National Fire Prevention Association NFPA The NFPA is an organization created to establish rules and guidelines that will help to prevent fires. Home Improvement Glossary natural bristle