How to find your lens size Your lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "?" (diameter) symbol. For example: ?40.5=40.5mm lens thread size. Compatibility Compatible with Sony E-mount 16-50mm F3.5-5.6 Lens for Sony Alpha a6600 a6100 a6500 a6400 a6300 a6000 a5100 a5000 DSLR Cameras . Please note that the size of the lens cap depends on the lens model, not the camera model.Please Contact us to confirm your lens size if you are not sure about your lens size Protects the lens from scratches, moisture, dust and fingerprints when the lens is not in use. Contents: 3 x 40.5mm Lens Caps In addition?You may be interested in screen protector for a6400 a6300 a6000 a5000, please search ASIN: B07R5CPL7X on Amazon for 10% OFF?enter code A6400A6000 at checkout. About our services? We are offer 3 month money back guarantee in case you are not 100% satisfied and wish to return the product for any reason. If you have any question, please send us a message,and we will reply you within 24 hours . If you are not satisfied, before you leave a Negative/Neutral feedback, please send us a message to tell us for a FULL REFUND or new REPLACEMENT. If you are satisfied with our products, please don't forget to leave a Positive Feedback, we will appreciate your encourage. Thanks for coming to our store and enjoy your shopping!