Short RAM-201U-B:

Low-profile design with an overall length of 3.56″ and a socket-to-socket length of 2.5″

Medium RAM-201U:

Medium length double socket arm has an overall length of 5.69″ and a socket-to-socket length of 4.66″

Long RAM-201U-D:

Provides an extended reach with an overall length of 9.125″ and a socket-to-socket length of 8″