Tell Manufacturing's Grade 3 Alton DOUBLE Combo Packs contains two (2) Alton Knobs and two (2) Single Cylinder Deadbolts. These combo packs are great for projects, as they are professional grade residential hardware with all steel construction and no plastic parts to wear out or break. The CS300 series combo are available in a variety of finishes and has a lifetime mechanical warranty. These combo packs will work on doors 1-3/8" to 1-3/4" thick, with an adjustable backset on the knob and deadbolt for quick and easy installation. The Tell Grade 3 line offers a quality lock at a competitive price, that is great for your exterior and interior needs.