Telescope Accessories Astronomical M54 x 0.75 mm Crimpring Ring with Internal Thread

Small hole thread specification: M4 thread (6 of the same specification). Thread specification for large holes: M54 x 0.75 mm. Perforation specification: 6mm direct countersink, 2.4mm height, center 2.7mm through hole. Discover a wide range of essential telescope accessories, including various eyepieces, Barlow lenses to double your magnification and moon filters for comfortable moon observation. Our team offers 24/7 assistance in choosing the right accessories and always strives to ensure your satisfaction with each product.