The Spark Plug Punch was designed to resemble an actual spark plug you would find in a combustion engine. The sharp 11mm blade, our largest punch yet features a smooth twist action that quickly exposes or hides the blade, while the large key ring makes it easy to take on the go. Fine-tune the depth of your punch cut easily with the Spark Plug Punch. The 11mm blade offers three different variable locking positions to increase or decrease the depth of the cigar cut. The heavy-duty key ring is designed to withstand the elements and the all stainless steel body protects the razor sharp cylindrical blade that operates on a ball-bearing adjustment system that locks the blade into the closed position for added safety during transport.