This is a 2 in. polytape tensioner for wood posts. The plastic bolt has a split in it to run the polytape through to tighten at the end of a run. Once it is tight you use the two nuts at the end to keep it snug and tight.Specifications Fence Post Type - Wood Attachment Position - Front or Back Attachment Method - Nails/Screws Insulator Material - High Density Polyethylene Color - White Dimension - 7 x 3 x 2 in. Item Weight - 0.2 lbs.Features Use to adjust tension in line Use to end a line at corner or gate end Bolt has slit to run tape through and tighten - SKU: FMSP048