Gatehouse Brass Storm Door Cylinder Lock in the Screen Door & Storm Door Hardware department at Lowes.com
High Security pop-out T-handle cylinder lock, spring bolt, LD6714
50-120mm Length Brass Security Door Lock Cylinder for Mortise Locks - China Door Lock Cylinder for Mortise Locks, Brass Security Door Lock Cylinder | Made-in-China.com
Amazon.com: Door Lock Cylinder, Anti-Theft Lock Cylinder, Sturdy and Durable 60mm with Keys for Aluminum Doors Wooden Doors : Tools & Home Improvement