Dedicated socket is built to engage all 4 of the holes on a SRAM dub crank arm dust cap Features a common 3/8" square drive like the rest of our socket range and also has a hexagonal exterior so you can mount them in a vise and use the crank arm as the lever if so desired Marked for lefthand thread Fabricated from anodized alloy Abbey Tools are priced to be used as shop tools, not for resale Made in the USA; Bend, Oregon Model DUB Self Extracting Cap Tool Description Crank Dust Cap Tool Color Green