※ This listing is for one item, but there are 14 in stock. If you would like to order multiple items, please let me know and I will create a new page for you. I will discount the shipping difference. This is a 3.7mm pinhole lens. Suitable for replacing lenses in security cameras, intercoms, etc. Focal Length: 3.7mm Mount: M12 The liquid marks on the back are not dirt. They are adhesive used to fix the parts during lens manufacturing.