This dog door for sliding glass doors is designed for compatible openings from 75 7/8 in to 80 11/16 in. The M-size Pvc flap gives medium-sized dogs a dedicated opening through the sliding door insert. A 180 degree swing-open panel can open wider when moving larger items through the doorway. The aluminum alloy frame uses tempered glass window material, and the panel supports left or right installation in compatible sliding door tracks. Listed item weight with accessories is 19.2 lbs.