This dedicated socket is built to engage all 4 of the holes on a SRAM dub crank arm dust cap. These caps don't normally need to be removed but when you do need to work with them, few things work well. These tools feature a common 3/8" square drive like the rest of our socket range and also have a hexagonal exterior so you can mount them in a vise and use the crank arm as the lever if so desired. The sockets are also marked for the left hand thread (clockwise to loosen) this part uses. Compatible with all SRAM dub cranks, road/mountain/gravel. Made in Bend Oregon.