Designed to mount on any tabletop, the Humboldt Cork Boring Machine has an adjustable guide that permits holes to be bored in any part of a stopper. The knurled chuck accommodates the 9/16" (14mm) shank of the eight, plated-steel borers included with the unit. The steel borers range from 3/16" to 5/8" (4.8mm to 15.9mm) in 1/16" (1.6mm) increments. The machine dimensions are 6-1/2" L. x 6-1/2" W. x 11" H. (165mm x 165mm x 279mm).