Specification Brand : Orion BulletPoint1 : Also known as Bahtinov masks, Orion PinPoint Focusing Masks will help you achieve precise focus in seconds BulletPoint2 : This PinPoint Mask fits telescope tubes with an outer diameter of 158-193mm (6.22" to 7.59") BulletPoint3 : Orion PinPoint Focusing Masks produce a distinct, intersecting 3-line pattern once accurate focus is achieved BulletPoint4 : Three Orion-exclusive adjustable padded pegs provide a secure grip once installed on a telescope BulletPoint5 : Compatible with any type of telescope, and especially useful for astrophotography setups Color : black ExternallyAssignedProductIdentifier1 : 759270400095 ExternallyAssignedProductIdentifier2 : 0759270400095 Finderscope : Reflex FocusType : Manual Focus ItemName : 158-193mm ID Orion Pinpoint Telescope Focusing Mask ItemPackageDimensions_Height : 21.7 centimeters ItemPackageDimensions_Length : 1.4 centimeters ItemPackageDimensions_Width : 20.5 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : telescope-eyepieces Manufacturer : Orion ModelName : 158-193mm ID Orion PinPoint Telescope Focusing Mask ModelNumber : 40009 NumberOfItems : 1 PartNumber : 40009 ProductSiteLaunchDate : 2003-11-01T00:00:00.000-08:00 Size : small