Gerda PRO System (WKM4) cylinder insert 30g/35 with knob, satin nickel, class 6 D, box

GERDA Pro System Anti-Burglary Cylinder ? Unparalleled Door Protection

The GERDA Pro System anti-burglary cylinder is a high-security lock insert designed for mortise locks, providing exceptional protection against intruders. This anti-bumping and anti-drilling cylinder safeguards your home with advanced technology. 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, brass finishes, and with knob, thumb turn (WKM4), and gear (WKM4Z) options.

• 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 rating ? 6


• Top-tier 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. drill resistance, superior mechanical attack resistance)


• Recommended for fire doors


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


• Anti-picking protection (two additional upper latches)


• Anti-picking pins to prevent unwanted opening via bumping


• Additional anti-burglary bolt


• New double-diameter pins


• Includes 5 high-security keys, a code card, 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 the highest safety standards. All our certified cylinder locks are packaged in sealed boxes to guarantee their pristine condition and full functionality.

Due to the nature of this product, we cannot accept returns of opened or damaged packaging, as these items cannot be resold.

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

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