– 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 hole since the insert has guide .- Made of brass material, good thermal conductivity and heat resistance. Specification:Material: BrassThread Size: M3x0.5mmTotal Length: 4mm / 0.16″Outer Diameter（+0.5/-0mm）: 4mm / 0.16″ Package Content: 30 x Knurl Thread Inserts Nuts.