Birchwood Casey Choke Tube Lube 40015 prevents stuck choke tubes caused by corrosion, high stress of steel shot loads, extreme temperatures, and pressure from continued trap and skeet shooting. This cleaning kit helps your gear withstand heat and keeps your weapons from seizing, even with extreme temperatures. Birchwood Casey Choke Lube provides plenty of lubrication against friction and protects your firearms from the corrosive effects of rain and salt water.