Gerda PRO System X cylinder insert (WKM4) 40g/30 satin nickel knob, class 6 D, box

GERDA Pro System Anti-Burglary Cylinder ? Unmatched Door Security

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

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


• Certified 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)


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


• Recommended for fire doors


• Anti-drilling protection (internal cylinder protected by a hardened steel plate)


• Anti-picking protection (two additional top latches)


• Anti-bumping pins to prevent unauthorized entry via bumping techniques


• Additional anti-burglary bar


• New double-diameter pins


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

How to choose the right cylinder size?

Watch the video below.

Valued Customers, Please Choose Carefully

We are committed to your satisfaction and the highest safety standards. All our certified cylinder locks are packaged in sealed boxes to guarantee their integrity 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 here to assist you in selecting the right product.

Thank you for your understanding and we invite you to explore our offer.