For the Kowa 20-60x or 30x eye piece. The 88mm/77mm Kowa Eyepiece Cover provides protection to the front of the eyepiece. Suitable for those who wear glasses. The see through cover allows the user to keep the item on the spotting scope and if any scratches are to occur, the scope's eyepiece will be protected. Compatible with TSN-770 and TSN-880 series spotting scopes.