The attacker who clocked 'SNL' alum Chris Redd in the face was wearing brass knuckles ... and there were two men involved in Wednesday's brazen New York City attack.
Sources connected to Chris tell TMZ ... the attack left Chris with two black eyes and a huge gash on his nose, which required stitches. He was hospitalized after the attack and released shortly thereafter.
As TMZ reported ... both men were dressed as security guards and had masks covering their faces. We're told the attacker who approached Chris and hit him with brass knuckles was a heavyset man ... the other man was standing across the street, appearing to case the area.
Chris, we're told, was not able to identify anything about either suspect. Nevertheless, we're told he's meeting with cops who've gathered surveillance footage, with the hope of getting a lead -- if not from the images of the 2 men, possibly from their method of escape, be it on foot or in a vehicle.