Simplex LR-1021B-26D. Designed for Right Hand doors. Accepts the Best IC type key cored (not included). This lock will accept the Best compatible interchangable cores (not included) - purchase separately. UNICAN 1000 Series locksets are the best choice for limiting access to high-traffic, security-sensitive areas in commercial, institutional, and industrial buildings. Ideal for locations with a high personnel turnover rate, such as data processing centers, employee entrances, hospitals and R&D labs.