Beiter Scope Pins have been developed for the use with the K-Lens (center hole Ø1,5mm) and offer the most advanced aiming system on the market, all together with a unique feature: the fastest exchange of size and/or colour of your aiming you have ever seen!Not only: you can combine them with Scope-Pin Rings to have the Circle-Dot aiming option, widely used in Field Archery!