Customized Brass 3840 Type Self Tapping Internal and External Threaded Inserts M3 M4 M5 M6 Nuts for Wood and Plastic - China Threaded Insert and Brass Insert
E-z Lok EZ-400-M3 | Thread Insert Kit, 0.375 Inch Length, Brass, M3 X 0.5 Size, Knife Thread Type | Raptor Supplies Worldwide
Grainger Threaded Brass Insert - M3 | Grainger Guitar Parts
Pack of 5 x M3 Rubber Well Nuts (RUBNUTS) with Threaded Brass Inserts : Amazon.co.uk: DIY & Tools