M4 Knurled Brass Threaded Insert Nut

From the shop's description

M4 Knurled Brass Threaded Insert Nut Premium brass material, heat resistant, wear-resistant, acid-resistant rust-proof, anti-corrosive, high hardness for long time use. No need to counterbore or countersink the boss hole since the insert has guide pilot. Can be installed by ultrasonic or heat into thread tapered hole, or molded in during injection. Specification: Product: Knurled threaded insert nut Nut type: Knurled nut Material: Brass Color: Brass Tone Inner diameter: M4 Outer diameter: 5mm Hight: 8mm Application: Heat resistant, great for 3d printing Package Includes: 1x Threaded Insert Nut