Threaded insert

A threaded insert, also known as a threaded bushing or insert nut, is a fastener element that is inserted into an object to add a threaded hole. They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material, place a thread on a material too thin to accept it, mold or cast threads into a work piece thereby eliminating a machining operation, or simplify changeover from unified to metric threads or vice versa.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

RUBBERDOT

The humble rubber bumper, mastered — grip dots, feet, and non-slip fixes for every surface.

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