Haenel 6 shot magazine, 4.4 mm. Fits the models 33, 33Jr, 49, 49a, 310, 400, 410, 510, 570, 580, LP55R, Anschutz 275, etc.. This adapter is a solid plastic casting of the factory 6 shot magazine. To use this item, point the gun in a safe direction, cock the gun, put the safety on, turn it upside down, drop a lead shot in the magazine opening, insert the adapter, turn the gun right side up and you are ready to fire. It will not work on the Haenel model 33.