I am going to be blunt. You have never seen an artery cut by glass. I have. I was covered in blood. Head to toe. The room was saturated in blood. It poured out of the persons leg like a hose. Not the spurting off and on thing in the movies. Shot across the room. I applied a tourniquet that saved the persons life. It also helped that we lived only a block away from a hospital. He was in the hospital for a long time. His leg was permanently damaged. Deformed and didn't work properly. He was young. He will live with the consequences of an equally stupid thing done with glass the rest of his life. I had mental trauma that took many years to fully recover from. Yes it was his leg, but freak things happen and there are arteries in the hand. I urge you to reconsider doing this! It is dangerous. It isn't smart. It serves no viable training purpose. It won't increase any martial ability or skill. Everyone here is telling you the same thing I am. You do NOT have support here on MAP in doing this foolhardy thing.