not use trap pins.This ensures the turning of the cylinder key is extra smooth,while blocking access from bump keys. The lock barrel features unique anti-bump protection. This ensures the turning of the cylinder key is extra. The shell is zinc alloy, the lock cylinder is made of copper, has alkali corrosion resistance, and can use for a long time. Suitle for use with a wide range of doors including timber, composite,aluminium or patio doors with a Euro profile this approved door lock provides exceptional theft resistance against all forced methods of attack with anti-pick, anti-drill, anti-bump, anti-plug and anti-snap safeguards, providing extreme protection against unauthorised access to your patio doors., Manufacturer: EYZJQSTUV