2pcs 3mm C3/K10 Tungsten Carbide Precision Straight Shank Twist Drill Bit 20mmx12mmx2000mm it has good electrical insulation

it has good electrical insulation and flame retardancy

Made of good quality metal spring can withstand the pressure

Spring OD : 63mm

Impedance: 50 ohm

All-copper DB37 female

2pcs 3mm C3/K10 Tungsten Carbide Precision Straight Shank Twist Drill Bit 20mmx12mmx2000mm it has good electrical insulationThe solid carbide drill bit is made of a micro grain tungsten cobalt alloy with an average cobalt content of 6%. It has high hardness (HRC92), wear resistance, heat resistance, high bending strength, and resistance to stick. Provides faster cutting speeds than other substrates and is harder but more brittle. Large and spiral chip space design for fast and clean chip removal. Sharp cutting edge provides smooth cutting and no glitches. With good milling