Now for the picture mystery. Last week I showed:

which was correctly identified by Dave, Adrian, Wilma, Ellen D and Ragged Robin as being part of:

a fire guard / screen. Well done everyone.
All week I have been trying to find somethig for the new mystery object. At almost the eleventh hour I spotted:

which is a close view of .... what? If you would like to have a guess please leave it in the comments. They will be revealed, along with the answer, next Monday.