When it comes to home security, you want something you can trust - and Master Lock's double cylinder deadbolt delivers serious peace of mind. The polished brass finish looks classic and works with most door styles, while the exclusive SilvaBond antimicrobial protection actually helps control bacteria, mold, and mildew on the surface. This isn't your basic hardware store lock - it meets ANSI Grade 3 security standards, meaning it's been tested for durability and strength. The double cylinder design requires a key to open from both sides, providing extra security against intruders who might try to break through windows and unlock doors from the inside. The four-way adjustable backset (fits both 2-3/8 inch and 2-3/4 inch setups) with square or rounded corners makes installation straightforward on most standard doors. Whether you're replacing an old lock or upgrading your home security, this deadbolt gives you that solid, reliable feel when you lock up for the night. It's part of Master Lock's security sets that allow your deadbolt and entry knob to work with the same key for convenience. The quality construction means it will stand up to years of daily use without wearing out. Independent laboratory testing has confirmed the effectiveness of the antimicrobial finish, which is both long-lasting and durable. For homeowners who take security seriously, this deadbolt provides dependable protection that looks good while doing its job perfectly.