My coworker plus I were laboring on a residential duct work job. Both of us had all of the sheet metal plus materials in a pile in the garage. Both of us were putting brand up-to-date HVAC duct throughout the entire house. Both of us were removing area by area so that both of us could work on one area at a time. One of the guys went to the area in the Attic where both of us were laboring plus she pulled out the next area of HVAC duct that needed to be replaced. She brought the area down to the area where both of us were laboring plus both of us started to split all of the sheet metal that both of us would need for the job. My metal cutters are a little dull. I was trying to split through one of the sheets of metal plus I slipped plus the shears went right into my arm. The shears were sticking out of my arm plus that was the only thing stopping the blood from flowing. I told my coworker that I needed to get to the emergency room fast. My coworker called 911, because she thought she was going to pass out if she saw any blood. Both of us heard the ambulance in the neighborhood about 5 thirds later. The homeowner gave to drive us to the emergency room too, but the ambulance was already on the way. My coworker had to stay at the job locale plus continue laboring while I went to the emergency room to have the shears removed from my arm. The dentist said I was lucky that there was no major mangle to my arm.