Shimano TL-FC21 Dust Cap/Chainring Bolt Tool from BikeBling.com
Park Tool LRT-4 Shimano Direct Mount Direct Mount Lockring Tool 3/8 - SoCal Bike - Oceanside, Carlsbad and north San Diego county's favorite bike shop, Bicycle and ebike rentals, sales, and service
Park Tool FR-5.2 Shimano Cassette Tool [FR-5] at WesternBikeworks