Configurator that allows you to specify your scope rings as you wish. The scope rings are in each case suitable for any Blaser interface, made of steel and with black finish and anti reflexive treatment. You can choose from the diameter of rings - the right choice depends on the diameter of the main tube of your riflescope: 1 inch [25,4 mm] diameter 30 mm diameter [most common] 34 mm diameter Then you can choose the height of the rings - your aim is to choose such, that allows the riflescope to be installed as low as possible, while not interfering with the rifle yet: low medium high And lastly you can choose from the length of the base - all of them will fit any Blaser interface: Short base - total length 114,2 mm Long base - total length 139,2 mm Machined from durable steel in Czech Republic by JK-N.