This is a gear ring to follow the focus. The material is made of metal, which is not easy to be oxidized, strong and durable, not easy to be broken, and has a long life span and does not require frequent replacement. It is suitable for 46-110mm / 1.8-4.3 inch lens, and can be installed with 15mm / 0.6 inch lens barrel diameter rail. Suitable for digital SLR cameras, cameras, easy to install and remove, adjust the camera focus in a more accurate and smooth way. Feature: 【PRODUCT MATERIAL】The focus gear of this camera is made of metal, which is not easy to be oxidized, sturdy and durable, not easy to break, and has a long life. It does not need frequent replacement and can be used for a long time. 【SUPPORT ADJUSTMENT】The gear belt with the gear ring following the focus supports adjustment, which can be adjusted according to the lens size, with high performance. 【EASY TO DISASSEMBLE】This SLR camera camcorder equipment is suitable for digital SLR cameras, cameras, easy to install and disassemble, adjust the camera focus in a more accurate and smooth way. 【SCOPE OF APPLICATION】This focus camera accessory is suitable for 46-110mm / 1.8-4.3 inch lenses, and can be installed with 15mm / 0.6 inch lens barrel diameter rails, and can be purchased according to the characteristics of the camera. Specification: Item Type: Follow Focus with Gear Ring Material: Metal Color: As Picture Shown Gear ring fit for 46‑110mm/1.8‑4.3in lens Weight: Approx. 738.0g/26.0oz Application: DSLR, Cameras Package List: 1 x Follow Focus 1 x Gear Ring