HDD Engineered Rollers HDD Engineered Rollers – Built for Every JobHorizontal Technology, Inc. provides engineered rollers in multiple sizes, accommodating diameters up to 62”.No matter the scale of your project, we have the tools you need—available 24/7 to keep your operations running smoothly. Catalogues /PDFsDownload our latest Horizontal Technology Inc. catalogs, manuals, and brochures. Motor & Bit Catalog/Manual ViperTM Rock Reamer Catalog/Manual