If you're looking for a storm door handle set, then you have a couple of options to choose between. Storm door handle sets should be sleek, durable and practical. You can find patio storm door handles, storm door handle lock sets as well as replacement storm door handles among other products. A nice door handle can really add those finishing touches to a home, however function comes before style. Sliding storm door handles can be found at home improvement stores such as Home Depot and Lowes in a range of different styles and materials. Many of these units are non handed which is practical if you would ever need to move the lock, or if you're not sure which side the handle is one. So no matter what type of door hardware product you're in need of, you're sure to find a unit that will be just perfect for your structure and your decor. 
Prime-Line Black Mortise Lock Style Patio Door Handle
"3-15/16 in. Hole Spacing. Fits 1 in. to 1-1/8 in. thick door rails. Fist most all mortise locks systems. Non-Handed" 
Prime-Line Hook Style Surface Sliding Glass Door Handle
"Removable lock mechanism allows for left or right handing. Surface mounted handle with hook latch lock mechanism. Handle features an anti-lift key which engages a second slot in keeper. Key assures alignment of lock bolt into keeper and resists lifting of door" These handles can be found at lowes.com
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