206 Hub Nuts
These very important Nuts for 1935 models onwards hold the back Splined Wheel Hub onto the back Brake Drum. They are very shallow in the hexagonal spanner area and over the years they can become rounded off and difficult to tighten properly. If yours are dangerous, renew them and if you are on a tight budget, perhaps you could spend a bit less on chrome plating.
This item is now available to order online from the Singer Owner's Club and is no longer supplied by Hardwick Spares;
Buy Singer Merchandise | Singer Car Owners' Club (singerownersclub.co.uk)