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.