only the housing 20 of the release magnet 1 can be seen in the top view of fig1 . the housing 20 has a round collar 21 and a round depression 22 concentrically cut in the housing 20 . the depression 22 corresponds in size to the elements of conventional magnetically releasable anti - theft devices . for releasing such an anti - theft device , it is known to extend the part of the anti - theft device to be released into the depression 22 , whereupon the locking pin on the upper part of the anti - theft device can be pulled out of the released part . the housing 20 is represented in the side view of fig2 . the housing 20 has the collar 21 which , in the state where it is mounted on a table , rests on the table at an underside , wherein the other parts are inside the table itself and are not easily accessible . a first cylindrical holder 26 adjoins the underside of the collar 21 and receives a magnetic force amplifying ring 11 . the underside of the first holder 26 is adjoined by a second cylindrical holder 23 . the cylindrical holder 23 encloses the permanent magnet 10 . fastening means 27 are arranged laterally next to the second holder 23 and contact the second holder 23 and the first holder 26 . the fastening means 27 are used for fastening the release magnet on a table or the like . the fastening means 27 can be designed as dowel - like receivers for screws . however , many other types of the fastening means 27 are conceivable for fastening the release magnet in a table . fig3 represents the release magnet in cross section a — a as shown in fig1 in a vertical direction . the housing 20 is of one piece and encloses both the permanent magnet 10 and the magnetic force amplifying ring 11 completely and free of gaps . the permanent magnet 10 is located in the second holder 23 and is downwardly covered by a bottom 24 . toward the top the permanent magnet 10 is also seamlessly covered by a cover 25 . the cover 25 is a bottom for the depression 22 , which is used for receiving corresponding parts of anti - theft devices . the first holder 26 completely surrounds the magnetic force amplifying ring 11 . at an upper end the first holder 26 makes a direct transition into the collar 21 . on its sides , the depression 22 has slightly inwardly inclined flanks , which simultaneously form an inner part of the first holder 26 . in this example the fastening elements are designed as lateral projections on the second holder 23 and have vertical bores for receiving screws . the magnetic force amplifying ring 11 is arranged in the housing 20 above and approximately centered with respect to the permanent magnet 10 . the poles of the magnetic force amplifying ring 11 and of the permanent magnet 10 are arranged in such a way that like poles are located directly opposite each other and adjoining . the manufacture of the release magnet in accordance with this invention preferably takes place by means of a direct , single piece extrusion coating of the permanent magnet 10 and the magnetic force amplifying ring 11 , in a single work step . the magnetic force amplifying ring 11 is at a slight distance from the permanent magnet 10 . both the permanent magnet 10 and the magnetic force amplifying ring 11 are almost completely enclosed in the material of the housing 20 . this gives further stability to the housing 20 and prevents all undesired direct contact with the magnetic materials . small exhaust holes can be provided to accommodate the extrusion process , can be arranged in the bottom 24 and can subsequently be closed . it is easily seen that the release magnet in accordance with this invention has no gaps , no threads , or the like . for this reason neither humidity nor cleaning agents can reach either the magnetic force amplifying ring 11 or the permanent magnet 10 which are protected against soiling and corrosion . the plastic housing can be washed . as a flat disk which runs out towards the outside , the collar 21 cannot be grasped by pliers or other tools . it is also not possible to remove the permanent magnet by unscrewing the inner part . deliberate damage is practically impossible . the release magnets in accordance with this invention can also be embodied with the housing 20 in such a way that they can be erected on a table , screwed or glued on from above or below . thus the collar 21 can also be formed on the lower end of the release magnet and can have the fastening elements .