Gerda PRO System (WKM4) cylinder insert 35g/50 with knob, nickel, class 6 D, box

GERDA Pro System Anti-Burglary Cylinder ? Unmatched Door Security

The GERDA Pro System anti-burglary cylinder is a robust, mortise lock security solution. This anti-bumping and anti-drilling cylinder provides superior protection against intruders, safeguarding your home. The GERDA WKM4 cylinder, tested by the Institute of Precision Mechanics in Warsaw according to PN-EN 1303:2015-07, achieved a stellar classification: 1 6 0 B 0 C 6 D. The GERDA Pro System cylinder is approved for use in fire-rated and smoke-tight doors. GERDA Pro System door cylinders are available in satin nickel and brass finishes, and with a knob, thumb turn (WKM4), or gear (WKM4Z).

• Cylinder classification according to PN-EN 1303:2015-07: 1 6 0 B 0 C 6 D


• Certificate issued by the Institute of Precision Mechanics


• Exceptional mechanism durability ? 6 pins, over 100,000 cycles


• Over 2,700,000 key code combinations


• Highest security class ? 6


• Highest burglary resistance ? Class C (high) according to KT/402/IMP/2014


• Superior corrosion and temperature resistance -20/+80 degrees Celsius ? Class C (highest)


• Resistance to attack: Class D ? highest (5/10 min. drilling resistance, resistance to mechanical attack)


• Recommended for fire-rated doors


• Anti-drilling protection (inner cylinder secured with a hardened steel plate)


• Anti-picking protection (two additional upper latches)


• Anti-picking pins to prevent unwanted opening via bumping


• Additional anti-burglary pin


• New double-diameter pins


• Includes 5 high-security keys, a key code card, a screw, and elegant packaging.

How to choose the right cylinder size?

Watch the video below.

Valued Customers, Please Make Informed Purchases

We are committed to your satisfaction and prioritize high safety standards. All of our certified cylinder locks are packaged in sealed boxes, guaranteeing their pristine condition and full functionality.

Due to the product's nature, we cannot accept returns of opened or damaged packaging, as we cannot resell such items.

Please carefully review the technical specifications and precisely measure your door dimensions before purchasing. If you have any questions or concerns, our team is available to assist you in selecting the right product.

Thank you for your understanding and we invite you to explore our range of products.