Continuously variable Iris diaphragm lens screen shutter Aperture slot for microscope camera 4-60mm Description Brand new!High quality!Variable iris in the optical system can provide different diameter holes to meet the different requirements of the light, by adjusting the handle to change the aperture diameter.To adjust by the strength of the beam, Widely used on microscope,camera, etc. Wholesale discount,could customized according to your require.new stainless steel leaves,for high power applications. Materials：metal18 Blades D Min：4mmD Max：60mm ØA：90mmT：9mm that size measured by hands,please allow little error. Quantity: 1 pc Pictures Payment We only accept PAYPAL payment and all major creditcards accepted by paypal. Payment is required to be made within 7 days from the closing date of your sale or purchased. If you don't pay in time, we can't promise we will keep the item you offerded in stock all the time. Any problem with payment please contact us first. For getting back the trade final fees from ,we will file a non-paying buyer alert with . Shipping 1.We only ship items to your confirmed address in (except APO/FPO), so please make sure the address is correct before purchase. 2.Items of most orders will be shipped out within the handlingtime upon receipt of your payment confirmation and you can receive them within 10-21 business days. Delivery depends on destination and other factors, it may take up to 21 business days or more. 3.We are not responsible for import charges or fees. 4.Damaged on Arrival: When you sign the parcel, please check it carefully. You'd better take a video or photos when open it. If there is any damage or shortage for your parcel, contact your Post Office or Express company immediately, Please send video or photos to our service staff at the same time. response Your satisfaction is important to us. If you are not satisfied with our products Services, please contact us BEFORE leaving any neutral or negative response, we will try our best to resolve any issue. please give me a chance,I’d like do my best for you. We appreciate your positive response if you are satisfied with your purchase. If you satisfied our items and service, hope you could leave a positive response with all stars (Item as described, Communication, Shipping Time, Shipping and handling charges) for me. Please note that we are using the automatic response system which would automatically leave positive response to buyers after receiving positive response. *No refund or return is available for NEGATIVE response. Contact Us If have any question, Please contact us by message, or email. We care about our valued buyers, if you have any questions, our Customer Service staffs will be very glad to help you. We try our best to reply to your emails as soon as possible. Our Business time（Beijing）: 9:00A.M.-5:30P.M. Mon-Fri. Thank you!