Gehmann - Knobloch Centering Device 23mm (344-K) Front Iris * Ask a local gunsmith

*     Ask a local gunsmith prior to ordering to see if they are willing to do the work

and expands the case neck

Great for the user that is concerned about brass galling from heat buildup due to friction

The carbide cutting tools are custom ground in shop to match the shoulder angle of your cases

Gehmann - Knobloch Centering Device 23mm (344-K) Front Iris * Ask a local gunsmithPush on to your lens holder to assist alignment. The centring device is put in front of the lens or the open iris shutter for precice adjustment of the lenses. The lens then has the optimal adjustment i. e. precisely centred as soon as the sight picture shows a perfectly round target bull. After centring the device is taken off again.