A minor 7th flat five chord is created by flattening the 5th degree of any minor 7th chord. For example, a Cm7b5 chord contains the notes C, Eb, Gb and Bb (1, b3, b5 and b7). Because of the flattened 5th degree, this chord is sometimes referred to as a half diminished chord. Here are some common open minor 7th flat five chord shapes.
Cm7b5
Dm7b5
Dbm7b5
Ebm7b5
Em7b5
Fm7b5
Abm7b5
Bm7b5
F#m7b5
Gm7b5
Am7b5
Bbm7b5