Corner key and frame assembly thereof

摘要

A corner key (32) includes a first arm portion (321), a first engaging portion (325), a second arm portion (322), and a second engaging portion (326). The first arm portion (321) has a first outer side-surface (3210). The first engaging portion (325) is disposed on the first outer side-surface (3210). The second arm portion (322) is connected to the first arm portion (321) and has a second outer side-surface (3220). The second outer side-surface (3220) is unparallel to the first outer side-surface (3210). The second engaging portion (326) is disposed on the second outer side-surface (3220).