If you've ever hung cabinets, windows, or doors, then you know what a pain it is to shim them - especially when you don't have a helper. Speed-Shims make it easy to level and plumb ANY SURFACE - faster than ever before! Just open the layered shim block to the desired thickness (like a book) and then peel the extra away. It's like magic and each block has an adhesive back to hold it in place until fastened. No more holding, stacking, or trimming! Made of an engineered wood fiber, the packet contains six layered shim blocks, each measuring 3-3/8" x 1-1/4" x 1/2" thick. Made in China.