Check the listing for details. Thompson Center Contender Rear Sight Aperture - New - (#Z-600). Condition: New other (see details). Listed at 14.99 USD. Thompson Center Contender Rear Sight Aperture.New.Old stock.Overall height 3/8".Please look close as there are many versions of Contender sights.I don't know the vintage. *** Please look close and / or ask questions before buying. There may be different versions of this part. To be installed by a competent gunsmith.***We are a small family business and we appreciate each and every customer. The best thanks we can get, is our customers leaving us a positive feedback review. Our business is directly dependent on your feedback. If you are happy with your purchase please take a minute to do this. If there is a problem with your order please give us a chance to correct it, please do not hesitate to contact us.