※ Please carefully measure the ring size of your guide. If the size is different, it cannot be installed. If you can confirm the guide's model number, you will know the required size. We are selling rings in 4mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 10mm, and 12mm sizes, so if you are looking for a different size, please search from the list of our products. These are rings for SiC guides. Although not genuine Fuji products, they have good smoothness and are lightweight. (The shape is slightly flattened, so it is inferior to genuine SIC in terms of line noise.) Please use them for repairing broken guides or upgrading from hard guides. Just changing the top guide can make a big difference. They can be installed on guides with a 6mm diameter ring contact surface on the frame. Here's how to install them: 1. Prepare the guide frame. The ring contact surface of the frame should be pre-sanded and cleaned. 2. As shown in the third photo, hold the ring vertically and try to see if the ring passes through to the other side. It's ideal if it goes through with a little push. If it doesn't go through, widen the contact surface by sanding the frame with a rod file. 3. Insert the ring into the frame. If it's tight, gently crush it with protected pliers and insert it. (Photo 4) 4. Apply adhesive to the border between the ring and the frame. Epoxy adhesive, which has a time allowance, is more suitable than instant adhesive. Apply adhesive to the tip of a needle or toothpick, and trace the outer circumference of the ring, applying it to both the back and front surfaces. It's okay if the adhesive is applied thinly. Be careful as the ring may break if it receives a strong impact. When it breaks, it breaks easily with a crack, so be careful when inserting it with pliers. It comes in a set of 3 for when you fail. Although the adhesive strength will be lower, it is also an option to sand the frame more and insert it loosely. If you use epoxy adhesive, it won't come off easily, so you don't have to be too perfect. If you do it well, you can convert even cheap guides to SiC guides. If you are interested, please try it. This is a special item, so please ask if you have any questions.