Description: To assist the focusing ring of the focusing ring of the focus ring on the lens. The focus wrench is suitable for the manual lens such. This focus wrench is made of silica gel, can prevent your lens from scratch when you focusing the lens. It help you sense the relative angle of lens to control focusing, and after practice, you can finish focusing without seeing the screen. Suitable for many different brands of cameras, for Leica/Zeiss/Pentax/Voigtlander Manual lens, Nice accessory for photography lovers. Specification: Material: Silica Gel Color: Black#1 (Single Layer) Size: Approx. 4 * 0.7 * 0.8cm / 1.57 * 0.27 * 0.31inch Package Includes: 1 Piece Focus Wrench (8 Pack) : 1. If the lens focusing ring is rugged in average, you need to use the quick focusing wrench with glue. But please be careful that do not hurt the lens. 2. Please attach the quick focusing wrench to the smooth side that on the lens focusing ring. 3. If the lens bring the quick focusing wrench itself, there is no need to purchase this wrench.