The power units for the manufacturer’s electric vibrators range from 1 1/2 to 3 hp, or 10,000 vpm under load. Heavy-duty motor windings and oversized brushes ensure optimum performance. With shock-absorbent frame, the unit can be fitted with soft-tip and coated heads available in three different lengths, ranging from 1 1/2 to 2 3/4 in. Northrock Industries. 800-989-8423.