Spirol International manufactures Dowel bushings which have a hollow design. This configuration permits a fastening screw or bolt to pass through the inside diameter, thereby eliminating the need to drill a separate hole. A staggered seam prevents interlocking, making the bushings suitable for automatic feeding and eliminating the need to separate them during manual assembly. The Dowel bushings are made of carbon steel with a hardness of HV 420-545, and can be finished as plain/oiled, zinc plated, or phosphated/oiled.

RotoPrecision carries the NB stroke bush, a linear and rotational mechanism utilizing the rotational motion of ball elements between an outer cylinder and shaft, and the NB slide rotary bush, comprised of a retainer similar to that used in the SR and SM type bushes.