ITEM NAME:100Pcs M3x6mm Threaded Round Brass Knurl Thread Insert Nuts Brass Tone Nuts. PSE Specification: Brand new Material: Brass Main color: brass tone Length: approx. 7mm Feature: Brass material, can resist heat. Not easy to rust, strong corrosion resistance. No need to counterbore or countersink the boss hole since the insert has guide pilot. Used on the injection moulding for tightly fixing. Package included: 100pcs x Knurled Nuts Note: Please allow a little size errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.100pcs x Knurled Nuts. Used on the injection moulding for tightly fixing. Main color: brass tone. Brass material, can resist heat. Material: Brass. No need to counterbore or countersink the boss hole since the insert has guide pilot.