This is a set of four 25.4mm (1") diameter round bench dogs. Made for the Sjöbergs Elite 1500 and 2000 benches, they can be used on any bench with 25.4mm (1") dog holes. These are made from aluminum, so they are kinder to edge tools in the event of inadvertent contact. The dogs feature an integrated spring which holds the dog in position at your chosen height. The slightly tapered flat faces of the dogs hold your workpiece securely on the bench top. Diameter 25.4mm(1"), length 195mm.