Please read full description. These will not work if you do not have left hand threads on your binoculars.  

• 

New custom machined eye pieces for Nikon Monarch Binoculars. Machined from solid black Delrin palstic. The original eye pieces are bad about cracking and the only way to repair them is to send them back to Nikon, only to have them crack again. These eye pieces DO NOT telescope down for use with eye glasses nor do they break or crack EVER, and are one solid piece. Will fit any 1 1/4 x 42 left hand thread such as Nikon Monarch. To replace the old eyepiece unscrew it from binoculars in a clockwise direction (left hand thread) peel rubber eye cup off eyepiece, it is tack glued in a few places. Clean the eye cup and reglue to the replacement eyepiece. Then screw it back onto binoculars CCW (left hand threads). SOLD AS A PAIR.

This does NOT include the rubber eye cup you must reuse the original. 

Please Note that if your binoculars have a right hand thread such as Nikon Monarch 3's

These will NOT work on your binoculars.