This is a compatible tool for Shimano cassette sprockets! The last image shows an example of the gears this tool is for; it can be used with the HG type on the right. If you have any questions about compatibility, please ask! I will answer to the best of my ability! It is compatible with 8-speed or higher Shimano shifting systems, except for some folding bikes! Please note that it is not compatible with the Capreo series of folding bikes. A 19mm/24mm spanner or monkey wrench is required. A 12.7mm square socket wrench can also be used! The third photo is an example of a sprocket and is not the item for sale, but please check carefully as the necessary tools will differ for HG cassettes. Please understand that I will not negotiate a price reduction for this item alone. I will consider discounts for combined purchases or purchases with other items, so please comment. Please purchase without comment unless you are in a hurry. (Shipping may be delayed by more than a week due to long holidays or business trips; if you are short on time, please be sure to contact me in advance to confirm the delivery date.)