1.pendent fire sprinkler 2.brass or zinc made 3.size:DN15/20 4.Dia of glas bulb:5mm or 3mm Specification of the pendent springkler, fire sprinkler, fire sprinkler head,fire-fighting, spray nozzle, centrifugal sprinkle1. Brand name: Jing Yuan2. Orifice size:1/2"3/4"3. ISO certification, CCC4. brass with chrome platingAnother type you may be interested in