... : button bits, chisel bits, cross bits Model Number: X,XX,EX,EXX,EC,ECC,ESF,ESSF,ESD,ESSD,EY,EYY DingRun High Quality Drill ... /hardened button drill bit Φ51Φ76Φ100 ESSFTungsten carbide button drill bit Φ51Φ76Φ100Φ120ESDCast/hardened button drill bit Φ115 ESSDTungsten carbide button drill bit Φ115Φ115 EYHardened tri-crescent drill bit Φ76 ...