Specification AgeRangeDescription : adult Brand : ANFKUN BulletPoint1 : The hoop is made of PVC and comes with 6*20mm long screws. BulletPoint2 : The tail of the screw is a hexagonal screw, which is less likely to loosen than slotted screws and cross screws. BulletPoint3 : It is equipped with a matching small wrench, which can easily solve the instability problem of the main mirror without drilling holes and tightening screws on the main mirror. Connected with the dovetail plate, it is very practical and convenient to place the primary mirror on the equatorial mount. BulletPoint4 : Packing list: 1 pair of rings = 2 rings BulletPoint5 : 【Product Includes】Lens*1 Color : Inner Diameter 75mm CompatibleMountings : Canon EF ExternallyAssignedProductIdentifier : 9006667043825 FocalLengthDescription : 1 FocusType : Auto Focus IncludedComponents : Lens*1 ItemName : ANFKUN 75-250mm Ring Hoop Bracket for Refraction and Reflection Astronomy Strips(Inner Diameter 75mm) ItemPackageDimensions_Height : 1 centimeters ItemPackageDimensions_Length : 3 centimeters ItemPackageDimensions_Width : 2 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : camera-and-camcorder-lens-bundles LensDesign : special Manufacturer : ANFKUN MaxFocalLength : 10 millimeters MinFocalLength : 10 millimeters ModelName : ANFKUN ModelNumber : ANFKUN NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : ANFKUN ProductDescription : The hoop is made of PVC and comes with 6*20mm long screws. The tail of the screw is a hexagonal screw, which is less likely to loosen than slotted screws and cross screws. It is equipped with a matching small wrench, which can easily solve the instability problem of the main mirror without drilling holes and tightening screws on the main mirror. Connected with the dovetail plate, it is very practical and convenient to place the primary mirror on the equatorial mount.