Open muzzle for Cressi Cherokee, Comanche, Pacific and  Geronimo spearguns. Muzzle insert peg outer diameter is 25mm, fits the Cressi spearguns and all standard speargun tubes with 25mm-26mm inner diameter. Shooting line can be routed to the left or right. Magnet in the track to retain shaft. Built in stainless steel reel line guide/shooting line anchor. Plastic pin to secure muzzle in the Cressi speargun tube, and a stainless steel screw for all other tubes are included.