Attributes . Slides apart to accommodate joist spacing from 16 in. to 24 in., screws provided; Metal protection plate included; Nail spurs for easy brace positioning; #10-32, 1 in. long ceiling fan screws provided and #8-32 ceiling fixture mounting provisions; Supplied with three 1/2 in. knockouts; Easy installation, up front ground screw; Easy to follow instructions and mounting hardware included . Names