The Handlock R15 30x40 brass security cylinder is a high-quality, durable product. With a 10-piston system and protection against anti-bumping, anti-drill, anti-break, anti-crowbar, anti-extraction, and anti-pick locks, it guarantees a high level of security (level 4). In addition, its double-clutch system allows you to leave another key inserted on the opposite side, offering greater convenience and versatility. It includes 5 spare keys with plastic heads, all with point security. This cylinder is suitable for master keying and has a lifespan of over 100,000 cycles, making it a durable and reliable option. Compatible with the JMA CI-21 (42705) spare key, this cylinder is the ideal choice for those looking to effectively protect their home or business.