These are a drop in replacement for and work well with the standoffs that come on the Bessey K-Body REVOlution Parallel Bar Clamps. In my use case I needed more support on the face of my glueups so I designed these to augment the provided standoffs. These have a slight draft angle on the inner faces to make them an interference fit with the clamps. That makes them snap on snugly and not rattle around when you adjust your clamps on the table.
The author marked this model as their own original creation.