Stand Off Spacer for Dia-Compe Rear Brake
If you have an old school frame with a flat brake bridge like a Raleigh Burner, Robinson, Torker, etc (rather than a tubular one) instead than using a ton of washers why not get one of these spacers similar to what Dia-Compe themselves supplied back in the day.
Machined from aluminium.
15mm (originals were 16mm).
Works on all standard 6mm caliper rear brakes.