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King kong drills steel has high fatigue strngth, toughess and offers high wear resistance giving an efficient and economic drilling operation .the unquie wear resistant carbige grade in our integral drill steels, in combination with  the generous carbide volume, provides extend service  life in all applications. our unique r23 rods and bits for extension drilling  provide the strongest thread in hole sizes 33-45mm . for the most aggressive applications we have fully carburized rods with the superior wear reistance and service life. in fact working with the sandvick means that you can expect consisit high quality and max operational dependability when it comes to all smallhole drilling application .64mm.t38 thread drill button bits.

Underground long-hole Drilling tools mvehicle for mining tools mainly equipped with guide rail type pneumatic rock drill, and a full hydraulic drill rig truck for underground mine,long-hole blasting holes, and a retaining hole drilling. T38 thread drill button bits diameter including 64mm,76mm,89mm,102mm.  we also can provide standard and retrac skirt including cross bits, button bits etc. 

King Kong's Tungsten carbide inserts are same as Sandvik YG05 sizes. and we also use the same technology as Sandvik including the steel materials and Heat treatment.

Button bits should be reground when penetrati on rat es drop or if the cemented carbide shows signs of damage
Fixed grinding routines often result in good working practices.
Bits for instance, can be examined and then reground after a specific number of holes, or at the end of the shift. Premature grinding is not necessarily uneconomical since less carbide needs to be ground off. It is better to regrind rather than reducing productivity due to damage.
Correct grinding adds considerably to drill bit service life. But equally important, it also enhances the performance of the entire drilling operation, especially hole straightness.