Machine-mounted drills are now available with several features to increase safety and productivity in dowel-pin applications, and are available in hydraulic and pneumatic options. Primarily used for dual-depth repair or patchwork, the excavator, backhoe, and skid-steer-mounted units are ideal for horizontal patchwork jobs with a relatively long distance between the areas to be drilled. Minnich Manufacturing. WOC Booth C5289