Headwalls made with Lock-block™ units are a simple way to install pipes through a retaining wall. The walls themselves are available in both full scale Lock-block™ size and landscaping size (1/2 scale in all dimensions). We offer three void sizes designed to accommodate a variety of pipe sizes to best fit your project. There are many ways to make a culvert; we produce Lock-Block™ units with 3 different pipe diameter voids in both full scale and landscape sized blocks. Or, standard units can be placed around a custom pipe or culvert of any shape.