Topeak super chain breaker tooldesigned for use with shimano hg and most other chains except 11 speed includes 5 and 6mm allen wrenches and a chain hook features tool materialhardened steel tools 3 total size l x w x h 76 x 4 x 19cm allen wrenches56mm bodyhardened steel chain hooksteel wire chain toolcast chromoly steel weight65gbuytopeak toolsfrom chain reaction cycles the worlds largest online bike store