Therma-Tru Adjustable Strike boss for 7/8 inch T-Astragal.
The Strike boss moves up and down for proper position of deadbolt location or handle height 
Tighten screws on strike plate to hold in desired position

NEW Style:  7/8" wide
Length: 2"
Width: 13/16"
Thickness: 7/16"
Track Width: 3/8"
Material: Plastic
Color: White

Old Style: 5/8" Wide
Length: 2"
Width: 1"
Thickness: 1/2" 
Track Width: 3/16"
Material: Plastic
Color: White

New Style will not fit old 5/8 astragals - Not interchangeable