Specification Brand : SASKATE BulletPoint1 : Scope of Application: 1.25 inch to C CS mount adapter fits any telescope C mount (male thread) telescope eyepiece changer with a 1.25 inch eyepiece tube. BulletPoint2 : 1.25 Inch Mount and M25 Thread: The 1.25 inch mount is suitable for filters, focus reducers, and extenders. M25 external thread is suitable for C mount or CS mount camera lenses. BulletPoint3 : Aluminum Alloy Material: Made of black anodized aluminum alloy, which is wear resistant, sturdy. The adapter is fully threaded inside to minimize reflections of stray light. BulletPoint4 : Internal and External Thread Specification: External thread specification is M25x0.75mm (commonly known as C mount, CS mount thread). Internal thread specification is M28.6x0.6mm. BulletPoint5 : Adapter Size: External thread depth is 5mm / 0.2in, internal thread depth is 4mm / 0.16in, outer diameter of mount is about 1.25 Inches (31.6mm±0.1mm), overall length is 30mm / 1.2in. ItemName : 1.25 Inch Mount to C CS Mount Adapter Elescope Accessories for Telescope Astronomy Camera ItemPackageDimensions_Height : 4 centimeters ItemPackageDimensions_Length : 4 centimeters ItemPackageDimensions_Width : 4 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : telescope-photo-adapters Manufacturer : SASKATE ModelName : SASKATE5k8z2ovg41 ModelNumber : SASKATE5k8z2ovg41 PartNumber : SASKATE5k8z2ovg41 ProductDescription : Specification: Item Type: 1.25 Inch Mount to C CS Mount Adapter Material: Aluminum Alloy External Thread Specification: M25x0.75mm (Commonly Known As: C Port/CS Port Thread) External Thread Depth: Approx. 5mm / 0.2in Internal Thread Specification: M28.6x0.6mm Internal Thread Depth: 4mm / 0.16in Outer Diameter of Mount: Approx. 1.25 Inches (31.6mm±0.1mm) Overall Length: Approx. 30mm / 1.2in Color: As Pictures Shown Weight: Approx. 16g / 0.6oz