Specification Brand : Acouto BulletPoint1 : Materials : aperture diaphragm The aperture diaphragm is made of aluminum alloy and stainless steel , strong and sturdy , very in performance . BulletPoint2 : 1 . 5mm To 26mm : M30 to M37 Adapter The aperture has an outer diameter of 45mm and an inner diameter of 1 . 5mm to 26mm , which provides small holes with different in the optical system to meet different light requirements . BulletPoint3 : Highly Stable : Outer Diameter 45mm This diaphragm is light weight , will not add extra weight for optical systems , with high strength , and , very stable . BulletPoint4 : Simple : M30 to M37 Just use the handle to change the aperture diaphragm diameter , which is easy to operate and more directly for adjustment . BulletPoint5 : Wide Application : Manual Diaphragm This aperture diaphragm is suitable for cameras , microscopes and other machines , which can help them work better . Color : Transparent ItemName : Acouto Aperture 1.5mm to 26mm ID 45mm OD M30 to M37 Aperture Diaphragm for Optical System Camera Microscope Variable - Aperture Aperture Diaphragm ItemPackageDimensions_Height : 2 centimeters ItemPackageDimensions_Length : 6 centimeters ItemPackageDimensions_Width : 6 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : video-projector-lenses Manufacturer : Acouto Material : acrylic, PMMA ModelName : Acouto6n9u0w2oxe ModelNumber : Acouto6n9u0w2oxe NumberOfItems : 1 NumberOfLithiumMetalCells : 1 PartNumber : Acouto6n9u0w2oxe ProductDescription : Item Type : Aperture Material : Aluminum alloy , stainless steel Inner Diameter : Approx . 1 . 5 - 26mm/0 . 06 - 1in Outer Diameter : Approx . 45mm/1 . 8in Number of Blades : 14 Thickness : Approx . 14mm/0 . 6in Thread : M30 to M37 ProductSiteLaunchDate : 2024-10-16T12:24:47.145Z RequiredProductComplianceCertificate : 1 Size : 14.00X9.00X0.20CM SupplierDeclaredDgHzRegulation : not_applicable UnspscCode : 41111700