Product Details:Material: BrassFemale Thread Diameter: M4Total Length: 8mm/ 0.31"Outer Diameter: 5mm/ 0.2"Package Content: 200pcs x Knurled Insert NutsMaterial - The knurled thread insert nut is made of brass, which is not easy to rust, is anti-corrosion, easy to conduct heat and has good conductivity. It makes the nut can be heated quickly and inserted easily, greatly reducing your working time.Feature - Knurling design has better pull-out and torque resistance so that it will not easy to fall off and is easy to fix. The embedding nut has a guide valve so there is no need for a counterbore or countersink.
eBay