R32, T38, T45, T51, GT60 Thread Button Bit, Used in bench drilling, underground long hole drilling to match extension drill rod, heavy duty top hammer Premium designs and steel and premium tungsten carbide insert grade T6 supplied by Boart Long year, Offers industry-leading strength and penetration rates for more productivity,Excellent straightness and hole clean quality,Get max.drilling performance for rock drills with long life to save up fuel cost rate.