What do you call those thin metal pieces that fold to fasten the cardboard back on a picture frame?
2 Answers
Points
Thin metal tabs used to hold the mat, mount board and/or glazing inside of wood picture frames. Some points are stiff while others are flexible to allow access into the frame.
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3For the simplest fixings at the edge of a frame. brads and gimp pins are small, headless nails; sprigs are blue steel, often triangular.– HughJun 23, 2017 at 9:44
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Happy to give this a +1: the OP wasn't clear about whether he wanted generic terms or industry jargon.– Andrew Leach ♦Jun 23, 2017 at 11:46
If you're asking about something like this:
then they are clips. This image is from a page advertising "Wood picture frame spring clips" from webpictureframes.com.
Other designs are available, including those which fit into a slot in the frame. This type isn't very adjustable for different thicknesses of cardboard but they are still clips (as are the hanging clips also shown here):
(Image from dataliteframes.co.uk)