EE WAS DEBURRING BUSHINGS HE HAD MADE FOR SHOVEL BRAKE SIDE PLATES. THE BUSHINGS ARE 3""X3/4"" LONG. WHEN HE WAS SCAPING THE UBRR OFF THE EDGE OF ONE OF THE BUSHING WITH A DEBURRING TOOL HIS HAN D SLIPPED AND X HE CUT HIS LEFT BASE OF THUMB. REQUIRED SUTURES.