Henry replace my old rusty deadbolt and installed a new high security Mul-T-Lock deadbolt at my home and did a flawless Job was done very neatly and Henry explained why this model provides better protection while he was working on it, measured everything precisely, and installed it with impressive accuracy. He also checked the hinges to improve the closing action of the door. The lock and keys look and feels much stronger and safer, I am totally satisfied and extremely happy with the service.