Jellyhead Choke Tubes are crafted with the most demanding turkey hunters in mind. They are designed to increase the range and pattern density of Hevi-Shot, copperplated lead or regular lead. The fluted port allows gases to vent quickly, which reduces the felt recoil and slows down the wadding to prevent distortion of the shot pattern. These screw-in turkey choke tubes have a knurled end, which extends beyond the end of the barrel for easy installation and removal without the use of any tools. JellyHead Choke Tubes have a 90% pattern density at 40 yards.