“Guangjing brand” concentric drill bit, with 40-year reputation guarantee, is produced with high-purity industrial diamonds and high-strength aviation alloys. Testes with over 120 drilling rigs, it is proved that the drill bit is a best option for sampling and coring of concrete pile foundations of high-rise buildings.
|Diameter(mm)||Inner Diameter(mm)||Grade||Lifespan||Speed||Concrete Grade
|101||83||Red, optimized for life span||150~180 meter||10~15 minute per drill||C30，C35，C40
|101||83||Golden, optimized for speed||110~140 meter||7~12 minute per drill||C30，C35，C40|