As the industry leader, Kwikset has provided trusted security for over 70 years and has become synonymous with security, peace of mind, style, and innovation. The largest-selling deadbolt in America, the 600 series provides tough, effective protection at an affordable price. This single-cylinder deadbolt is operated by a key on the outside or a thumb turn on the inside.; ; Brand Name: Kwikset Sub Brand: SmartKey Security Finish: Polished Brass Material: Metal Product Type: Single Cylinder Deadbolt Indoor or Outdoor: Outdoor Height: 9.1 in. Width: 4.5 in. Commercial or Residential: Residential Minimum Door Thickness: 1-3/8 in. Compatible Key Numbers: KW1/SC1 Number of Keys Included: 2 Maximum Door Thickness: 1-3/4 in. Door Direction: Left and Right Grade: 3 Grade Packaging Type: Carded Bolt Length: 1 in. Number in Package: 1 pk Backset: 2-3/8 in. or 2-3/4 in.