EMPLOYEE WAS REMOVING LID FROM PLASTER BUCKET. HE HAD HAND TOOL TO REMOVE THE LID IN HIS HAND. WHEN HE PULLED UP ON THE LID, THE TOOL SLIPPED OFF THE LID, STRIKING HIM ON LEFT CHEEK UNDER HIS EYE. CAUSED A 1 INCH CUT AND BLACK EYE. HAD 5 STITCHES. NO LOST TIME.