[SIZE] - M3x0.5mm thread size, 0.24' (6mm) long, 0.16' (4mm) outer diameter. [MATERIAL] - Made of brass, rust resistance, good thermal conductivity and heat resistance, can ensure long time using. [FEATURE] - Can be installed by ultrasonic or heat into thread tapered hole, or in during injection. [ADVANTAGE] - No need to counterbore or countersink the boss hole since the insert has guide pilot. [APPLICATION] - Widely used on injection for fastening.