Gerda PRO System cylinder (WKM4) 35/35 brass, class 6 D, box

GERDA Pro System Anti-Burglary Cylinder ? Superior Door Protection for Every Home

The GERDA Pro System anti-burglary cylinder is a complementary security solution for mortise locks, providing superior protection against intruders. This anti-bumping and anti-drilling cylinder safeguards your home. The GERDA WKM4 cylinder has been tested by the Institute of Precision Mechanics in Warsaw according to the PN-EN 1303:2015-07 standard, achieving a classification of 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 with a knob, thumbturn (WKM4), or gear (WKM4Z).

• Cylinder classification according to PN-EN 1303:2015-07 standard: 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


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


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


• Recommended for fire-resistant doors


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


• Anti-picking protection (two additional top latches)


• Anti-picking pins to prevent unauthorized opening using bumping techniques


• Additional anti-burglary bar


• New double-diameter pins


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

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

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

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