Robbins 91 and Robbins 123 are raiseboring machines for holes ranging from 2.4 to 6.0 m (8-20 ft.) in diameter. The large rigs can be relied on in a variety of applications. These powerful raiseboring rigs with a modular design for easy transport are ideal when weight or size limitations are a concern. At Atlas Copco, we strive to construct high-quality machines that are easy to set up, operate and maintain – and our Robbins 91 and 123 rigs are no exception. These machines are built to serve and built to last.