Fits standard UK dovetail rails.
Black plastic with metal fittings.
Accept inserts (one included).
The insert is 17mm in diameter and 0.5mm thick, marked as .4.4 (4.4mm aperture).
Total length is 36mm with a 18mm long rail fitting.
22mm diameter.
31mm high overall.
Weighs 15 grams.
They wont fit HW77 and some other Weihrauch rifles without adaption, as the front dovetail rails on Weihrauch rifles are a little too narrow.