The astronomical telescope eyepiece parfocal rings are designed to enhance your stargazing sessions. By ensuring your eyepieces remain parfocal, these rings eliminate the need for constant refocusing, allowing you to enjoy seamless and efficient observation experience. Their sturdy metal build makes performance, making them a valuable addition to any astronomer's toolkit. Features -Color:Assorted Color -Material:Aluminium alloy -Size:6.00X6.00X0.50cm/2.36X2.36X0.20in -Sharp viewing: the telescope eyepiece parfocal rings provide sharp viewing, allowing you to observe objects in fine detail -Exact focus: the parfocal ring design ensures exact focus, making it easy to achieve the great focus for clear and detailed images -Adaptable accessory: these rings are adaptable to various observational needs, making them a valuable addition to your telescope accessories -great design: made from great materials, these rings are designed to be great and , providing reliable performance -Broad telescope compatibility: these rings are compatible with a wide range of telescopes, making them ideal for both amateur and professional astronomers Package list: 2 x parfocal ring 1 x wrench