Brass Expansion Inserts for Plastics - M4 (Unheaded) | Shop4Fasteners
Turmberg3D Threaded Insert M3 (Pack of 100) / M3 x 5.7 Brass Threaded Sockets / Melting Nut for Plastic Parts for 3D Printer Parts (M3 x 5.7) : Amazon.co.uk: Business, Industry & Science
sourcing map Knurled Insert Nuts - 200Pcs M4 x 0.7mm Female Thread Brass Threaded Insert Embedment Nuts for 3D Printer : Amazon.co.uk: DIY & Tools
M3 M4 M5 M6 Threaded Press FIT Solid Brass Inserts for Plastic 105 Assorted KIT : Amazon.co.uk: DIY & Tools
Knurled Threaded Insert, Brass Recessed Nuts Female Thread M4 x 6mm L x 6.4mm OD, Pack of 50 : Amazon.co.uk: DIY & Tools