Shimano Snap Ring for Disc Brake Pad Axle – Ride Bicycles
Amazon.co.jp: Shimano SM-8S31 CJ-8S20 Accessory Set, Swivel Washer Straight Drop End (8R/8L) & Positive Claw (6R/6L), Bag Nut x 2, Snap Ring C ISM8S31A0270A : Sports & Outdoors
Shimano Disc Brake Caliper Snap Ring for BR-RS505/RS805/RS405/RS305, 1pc 689228353688 | eBay