Prime-Line MP4148 Sliding Door Pin Lock With Ring – Black Steel Security Lock, Pack Of 2

Need a simple, cheap way to make your sliding doors or windows more secure? These pin locks are a classic fix. Made from case-hardened steel with a zinc-plated black finish, they’re tough and rust-resistant. You install them between the moving panel and the fixed rail – just drill a hole, screw in the holder, and drop the pin through. The pin has a detent ball on each end to hold it in place, so it won’t just fall out. Helps prevent prying or lifting from the outside. Comes in a pack of two with all the screws included. Great for patio doors, basement windows, or any sliding surface where you want an extra layer of security. Not high-tech, but super reliable and easy to install yourself in minutes.