locks are suitable for all door types including wooden, metal, UPVC, patio door lock, This ensures the turning of the cylinder key is extra smooth,different installation needs and protect your home security. has a variety of stable security functions, have the functions of Anti-picking, Anti-drilling, Anti-snap, Anti-Bumping, When you insert the key to start using, the rotation will be smooth and there will be no jam, If you have any questions, please contact us directly, we will give you a satisfactory response within 24 hours.