Both the ABR-1 and Nashville Tune-o-Matic bridges consist of one oblong saddle which holds 6 saddle inserts and their corresponding string length (intonation) adjustment screws. Later ABR-1 bridges also have a saddle retainer wire that holds all the saddle inserts and screws in place. Both are mounted to guitars via two threaded "posts" that may be screwed directly into the guitar's solid body (old style), or into threaded anchors that are pressed into the body. These bridges are also used on some archtop hollowbody guitars, such as the Gibson ES175D, which use a floating rosewood or ebony base (or foot) with two threaded posts screwed directly into it.