- These Knurl Thread Insert Nut can be widely used on the injection for tightly fixing.- Can be installed by ultrasonic or heat into blind hole, or in during injection.- No need to counterbore or countersink the boss hole since the insert has guide pilot.- Made of brass material, good thermal conductivity and heat resistance. Specification:Material: BrassThread Size: M2x0.4mmTotal Length: 6mm / 0.24"Outer Diameter(+0.5/-0mm): 3.5mm / 0.138" Package Content: 100(+/-2%) x Knurl Thread Inserts Nuts