Air Arms Diopter Sights, RearFully adjustable windage and elevation dials.
Fits standard 9-11mm dovetail rails.
Aluminium frame with steel fittings.
Rubber concertina eyepiece.
The total length is 140mm with a 22mm long rail fitting.
50mm wide at the widest point.
58mm high overall.
The total weight is 225 grams
Rear diopter sight for target shooting purposes
Fits most rifles with dovetail sight rails
I've expected better quality and workmanship from Air Arms. Tolerances are not very tight. All moving parts are a bit wigly. But it works OK.