EE WAS CUTTING SOME OLD CONVEYOR BELTING WITH A UTILITY KNIFE & IT SLIPPED CUTTING HIM ON HIS LT. HAND BETWEEN THE INDEX FINGER AND THUMB. HE WAS TAKEN TO THE E.R. & HE RECEIVED STITCHES. EE SAID THE MATERIAL WAS ALREADY SCORED & HE WAS TRYING TOO QUICKLY. HE TOOK HIS GLOVE OFF SO HE COULD GRIP THE RUBBER MORE FIRMLY & THEN HE PULLED THE KNIFE TOWARD HIMSELF & SLIPPED.