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Patio door roller 1/4-20 x 1-3/4 Pan Head Machine screw common to many plain back patio door roller assemblies. 
Threads into the back of a roller housing and secures the vertical door stile to the roller assembly.
Used by Columbia and many other door companies

Thread: 1/4-20
Length: 1-3/4 inch 
Material:  Steel 
Patio door roller 1/4-20 x 1-3/4 Pan Head Machine screw common to many plain back patio door roller assemblies.&nbsp;<br>Threads into the back of a roller housing and secures the vertical door stile to the roller assembly.<br>Used by Columbia and many other door companies<br><br>Thread: 1/4-20<br>Length: 1-3/4 inch&nbsp;<br>Material:&nbsp; Steel&nbsp;