Everything is said in the title. This cable connects a housing 3 1/2 inch external USB 3.0 connectivity and effectively replaces the damaged or lost original cable. USB A on one side to connect to the PC B and the other to connect the housing. Warning: the B side is the USB 3 therefore not suitable for a USB enclosure 2 (different form) A bit short if you want to deport your drive takes up little space but if the goal is to put it near a tower or laptop. Banal, but what price.