This ADM 7″ Vixen-style universal dovetail bar includes two 100mm guidescope/finderscope rings. Fits popular Vixen-style dovetail bars (Synta, Meade, Celestron and others). The rings feature large 3/8″ aluminum adjusting screws with large 1/4″ Delrin Tips. The large delrin tips help to protect the finish of your OTA and prevent denting. Stainless steel and anodized aluminum throughout for maximum durability and ultra good looks.