EMPLOYEE WAS PUTTING ZIP TIES ON ANOTHER EE'S HARD HAT TO HELP SECURE HIS CUTTING GOGGLES. HE PUT ONE OF THE ZIP TIES ON AND USED A STANLEY POCKET KNIFE TO CUT OFF THE EXCESS ZIP TIE WHEN THE KNIFE CAME TOWARDS HIS LEFT THUMB HE CUT IT @ THE 2ND KNUCKLE ON THE BACKSIDE OF HIS HAND.