This is a custom-made focus lever created with a 3D printer. It's designed to fit the HELIAR classic 50mm F1.5 VM. This product is intended to be attached with double-sided tape. Please prepare the double-sided tape yourself. The sixth product photo shows different materials side by side. You will be able to choose which material you prefer after purchase. The left side is resin, and the right side is nylon. Adhesive residue from the double-sided tape may remain on the lens barrel. When I used it myself, a thin tape mark remained as shown in the 7th product photo. The double-sided tape I used was made by 3M. Please be aware that we are not responsible for any problems that may arise with your lens as a result of using this product. Purchase and use are at your own risk. The item for sale is only the focus lever. The lens and camera included in the product photos are not included. This is a listing for one focus lever. If you wish to purchase multiple items, please contact us in advance so we can adjust the price accordingly. Voigtlander Heliar Classic Voigtländer HELIAR classic 50mm F1.5 Focus Lever Focus Knob DIY 3D Print