※ 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. These are SIC rings. Please use them to repair broken guides. They can be installed on guides with a frame ring contact surface diameter of 10mm. 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 pass it through to the other side. It's ideal if it goes through with a little pressure. If it doesn't go through, use a file to sand the frame and widen the contact surface. 3. Insert the ring into the frame. If it's tight, gently crush it with protected pliers to fit it in (Photo 4). 4. Apply adhesive to the border between the ring and the frame. Epoxy adhesive, which allows time for adjustment, is more suitable than instant adhesive. Apply the adhesive with the tip of a needle or toothpick, tracing the outer circumference of the ring on both the back and front surfaces. A thin layer of adhesive is sufficient. Be careful as the ring can break if it receives a strong impact. It breaks easily with a crack, so be careful when inserting it with pliers. There are 3 pieces in a set in case of failure. Although the adhesive strength will be lower, it is also an option to sand the frame more and fit it loosely. If you use epoxy adhesive, it is unlikely to come off, so you don't have to be too perfect. If done well, you can convert inexpensive guides to SiC guides. If you are interested, please give it a try. This is a special item, so please ask if you have any questions.