This is used to put together square tube Bimini Tops.  They fit 1" square tube and are made of Nylon.  Square tube Bimini Tops are mostly put on pontoon boats.  We will sell them by the pair.  The Jaw Slide has a small set screw to hold it in place.  I will combine the shipping for multiple items.  Please check our store for other boating parts and supplies.  Thanks Brian