The Yale 401 is a robust 138mm rim sashlock engineered for internal applications where reliable security meets straightforward operation. Its 2-lever mechanism provides dependable deadbolt control from either side, eliminating the need for handed installation—a practical advantage for flexible door configurations. Designed for use with rim knobs on internal doors, sheds, and wooden gates, this non-handed lock delivers consistent performance across diverse mounting scenarios. The key-operated deadbolt ensures secure access management without compromising ease of use, making it an ideal choice for property owners seeking durable, uncomplicated locking solutions.