... mm 4.Spring in stainless steel and pins in brass Brass Door Lock Cylinder Material: Brass, Zinc Alloy, Iron, Al, etc.Length: 40 ... (normal key)Computer key Door Lock Cylinder Surface finishing :Gold plated, chrome plated,nickel plated, polished brass,satin nickel, satin chrome ... bias cylinderABantique bronzeRCround cylinderACantique copperHPhalf picks cylinder OCoval cylinder Brass Door Lock Cylinder