... of customers3,Material: ally steel, tungsten carbide insert4,Color: can be as you like 5,Size: from ... and you can rest assured if do business with us19,We are a professional supplier of new ... and high projection. This cutting structure design combined with maximum cone offset ,results in high bit penetration ... .5mm(6 1/8”),158.7mm(6 1/4”),161.9mm(6 3/8”),165.1mm(6 1/2”)190.5mm(7 1/2”),193.6mm ...