ALUMINUM ALLOY MATERIAL：Made of black anodized aluminum alloy, which is wear resistant, durable. The adapter is fully threaded inside to minimize reflections of stray light.
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.
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.
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.
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.
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