... 4. Double open or single open 5. OEM welcome Brass lock cylinder1.Material:Brass,stainless steel,Alloy,Zinc alloy,Aluminum.2 ... .Lock cylinder length(mm):30,40,50,60,70,80,ect. ... ..5.Finish:PB,GP,AC,AB,SN,NP,CP ect. high quality brass cylinder, profile cylinder, Euro profile cylinder, lock cylinder