Gritty Board Used to Smooth Finger Ends
Puzzle 16 of Group Activities Easy Pack
Question is: Gritty Board Used to Smooth Finger Ends
and the answer is: NAILFILE
Word Meaning:
NAIL FILE — A small file made of soft metal, or a board covered with fine sandpaper, for filing and shaping one's fingernails and toenails.
Definitions from Wiktionary.