The first is the ball-thrust bearing set for shaft diameters between 5 and 25 mm. The washers and balls in the red-nylon ball retainer are stainless steel.

The second ball-thrust bearing set has grooved washers for 3 to 10-mm shaft diameters. The third type is a carbon-steel needle thrust bearing set for 10 to 70-mm shaft diameters.

Ondrives Ltd., Foxwood Industrial Park, Foxwood Rd., Chesterfield, Derbyshire, S41 9RN, UK, 00 44 1246 455500, www.ondrives.com