Gerda PRO System cylinder (WKM4) 35/45 satin nickel, class 6 D, box

GERDA Pro System Anti-Snap Cylinder ? Unmatched Door Security

The GERDA Pro System anti-snap cylinder is a high-security lock insert designed for mortise locks, providing superior protection against intruders. This anti-bumping and anti-drilling cylinder safeguards your home with exceptional reliability. The GERDA WKM4 cylinder has been tested by the Institute of Precision Mechanics in Warsaw and certified to PN-EN 1303:2015-07, achieving the highest 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 cylinders are available in satin nickel and brass finishes, with knob, thumbturn (WKM4), and gear (WKM4Z) options.

• 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 rating ? Class 6


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


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


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


• Recommended for fire doors


• Anti-drilling protection (inner 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-snap bar


• New double-diameter pins


• Includes 5 high-security keys, key card, screw, and attractive 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. Therefore, all our certified cylinders are packaged in sealed boxes to guarantee their integrity and full functionality.

Due to the nature of this product, we cannot accept returns of opened or damaged packages, as we cannot re-introduce such products back into circulation.

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 and happy to assist you in choosing the right product.

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