material: aluminum alloy,zinc alloy,brass specification:40,60,70mm,etc available knobs for choosing finishing are available cylinder  lockmaterial:aluminum shell with brass core,zinc shell with brass core,brass.specification:40mm,60mm,70mm,etcfinishes are available:SN,NB,NP,SB,PB,GP,AC,AB,CPdifferent button pattern you can choose.dependable construction