This pack includes two yellow plastic line blocks from KRAFT TOOL CO, each with an item length of 3-3/8 inches. These line blocks are designed to be used with chalk line and will help you achieve straight lines in your projects. The item height and item width can be seen in the pictures. The line blocks are made of tenite plastic and come with no manufacturer warranty. They are manual measuring tools with a standard (SAE) system of measurement. These line blocks are perfect for those in need of other measuring and layout tools for their projects. Shipping is free on all my listings.