Complete Sight set for FX Biathlon and others with dovetail mount. High sight base set: 7,5 mm height increase. Rearsight: Strong double base clamps and stainless steel screws suitable for all types of rifle short mounting rail allows maximum movement of the sight for all iris attachments long standard-threaded tunnel enables use of all irises and anti-glare tubes bullet shift 1,5 mm per click at 50 meters. Iris: Adjustable over a wider range of 0,5 – 3,0 mm. Anti-glare tub: 50 mm. Foresight: M18 thread. Element Grip Collar: M18. Element: 3,6 Pole.