Product attributes: A modern replacement for a traditional chain whip. Pins on the tool engage the smallest 10T sprocket on the cassette, holding it in place, while a hole in the center allows easy access to the cassette lockout. material: premium flex plus carbon steel surface finish: chrome plated in accordance with ISO 1456:2009 ergonomic, durable two-component handle Single-sided, compatible only with Sram X-Range cassettes Ridges on the outside of the pins ensure a secure grip on the cassette The access hole allows the cassette locking tool to be fitted.