Gerda PRO System cylinder (WKM4) 30/35 brass, 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 to enhance the protection of your door. This anti-bumping and anti-drilling cylinder provides superior protection against intruders, safeguarding your home. The GERDA WKM4 Cylinder has been rigorously tested by the Institute of Precision Mechanics in Warsaw, in accordance with PN-EN 1303:2015-07, achieving a classification of 1 6 0 B 0 C 6 D. The GERDA Pro System Cylinder is approved for use in fire-resistant and smoke-tight doors. GERDA Pro System cylinders are available in Satin Nickel and Brass finishes, and 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 rating ? 6


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


• Exceptional corrosion and temperature resistance -20/+80 degrees Celsius ? 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 (internal cylinder protected by a hardened steel plate)


• Anti-picking protection (two additional upper 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 code 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. All our certified cylinder locks are packaged in sealed boxes to guarantee their condition and full functionality.

Due to the nature of the product, we cannot accept returns of opened or damaged packaging as these products cannot be re-sold.

Please carefully review the technical specifications and accurately measure your door 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 range.