Check the listing for details. 1-12mmMechanical Iris Adjustable Aperture Microscope Camera Module M4 Thread. Condition: New. Listed at 10.35 USD. 1 PC Mechanical Iris Adjustable Aperture 1-12mm Microscope Camera Optical Diaphragm Module M4 Thread Description Feature: D Min.: 1mm D Max.: 12mm ØA: 19.8mm(without mount),27mm(with mount) T(Thickness): 5mm(without mount),7mm(with mount) Material: Metal, durable Packing List: 1pc Iris Diaphragm Shipping Items are normally shipped within 1-2 working days of receiving (cleared) payment and will be shipped by air parcel to worldwide. We do offer combined shipping discount if you pay all together.The shipping & handling fee includes packing, warehouse and distribution costs, not postage only, these are non- refundable.The estimated shipping time is about 10 to 20 days to arrive buyers' location. All items will only be shipped to the address you registered with PayPal. please make sure yourshipping address on Ebay is correct BEFORE placing your order. Contact Us Your satisfaction is important to us. If you are not satisfied with our products/services, please contact us BEFORE leaving us any neutral or negative feedback. We will try our best to resolve any issue. If you satisfied our items and service, hope you could leave a positive feedback with all stars for me. We are using the automatic eBay Feedback system which would automatically leave positive feedback after receiving positive feedback. You can contact me if you have any questions. Our Business Hours（Beijing）: 8:30A.M.-5:30P.M. Mon-Sat