The All New TK3. This new release is complete with handy bottle opener, window punch and improved key chain hole to fit on just about any key ring. Making it the ultimate oxygen wrench for a wide variety of operating environments. Sized at 3 3/8” long, 1”, 5/8” wide and only 1 ounce, the new TK3 comes in the same vibrant colors as the TK2. Black, Blue, Red, Yellow and the new Hot Pink. The TK3 is not MRI safe due to the added hardened nickel plated steel window punch feature, so if you are an MRI Tech or EMS provider who does inter-facility transports for MRI patients we suggest the TK1 or Tk2.