Protect your telescope aperture with a reliable lens cap set designed to fit a wide range of inner diameters. Protects against dust, moisture and scratches, keeping optics clean and ready to use. Caliber (sizes available): 25.5 mm, 28 mm, 30 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm, 50 mm, 51 mm, 53 mm, 57 mm, 58 mm, 59 mm, 60 mm, 61 mm, 62 mm, 64 mm, 65 mm, 66 mm, 67 mm, 69 mm. Notes and compatibility: Aperture size is the cover inner diameter and also the telescope outer diameter. Please measure your telescope diameter before purchasing. Material: High-quality plastic, durable and not easy to break. Quantity: Lens caps are sold in individual pieces. Use scenarios: - During storage or transport to keep the tube free from dust and debris. - During maintenance or cleaning to protect the aperture and threads. - In the field when swapping accessories or changing tubes, to maintain a clean, secure opening.