Master Key Systems MKS Ltd is a family owned business that has been designing and manufacturing Cylinder Master Key Systems for over 20 years.

We stock a wide range of products including our own manufactured 5 & 6 pin master key system developed from its predecessor the E Suite 5 pin which has been in general circulation for over 15 years in applications as diverse as B & B's to MOD sites. Promaster has been developed from our very successful PRO series and is an entry level BSEN 1303 accredited range of cylinders for Master Keying.