Kwikset 85278 Square Corner Deadbolt Strike The Kwikset 85278 Square Corner Deadbolt Strike is a residential-grade deadbolt that delivers serious front-door security at a homeowner-friendly install time. The hardened-steel 1-inch throw bolt resists hammer, kick, and saw attacks, and the BHMA-rated finish keeps the lock looking new through years of weather exposure. Kwikset has been making American homes secure since 1946, and is the brand behind SmartKey re-keyable security and the Halo, Aura, and Premis smart-lock families. At RightSet Hardware, every Kwikset order ships with our Right Fit Promise — verified specs, accurate fitment guidance, and friendly support from a team that actually knows door hardware. If it doesn't fit your opening, we'll make it right. Why pros and homeowners choose the Kwikset 85278 Square Corner Deadbolt Strike Single-cylinder convenience. Keyed cylinder outside, thumbturn inside — fast egress without fumbling for a key in an emergency. Hardened steel bolt with 1-inch throw. Resists hammer, kick, and saw attacks better than entry-grade deadbolts with shorter throws. Anti-pick and anti-bump pin stack. Engineered to slow down picking, bumping, and impressioning attempts at the front door. Fits standard residential door prep. Adjustable 2-3/8" or 2-3/4" backset and 1-3/8" to 1-3/4" door thickness — no drilling required on most installs. BHMA AAA-rated finish. Top-tier corrosion, wear, and tarnishing resistance keeps the lock looking new for years of weather exposure. Quick install in about 15 minutes. Replaces an existing deadbolt with a Phillips screwdriver — no locksmith, no specialty tools.
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