Lock appears to have thinning hair, the only trace is at the back of his head. His regular attire consists of a pink polo shirt with a pocket and a purple bow tie he also is shown to have purple pants like Klank. Like most bots, he has light blue eyes and black pupils. He has a much deeper voice than Klank.
His personality is much less humourous than his partner Klank, as the latter constantly pulls pranks on him.