... Rock Drill Bit 1, Factory supply drill bit 2, One set drill bit can use at least 3 months. 3, Rock drill bit ... made in CHINA. Cross Drill Bit Tools1, Factory supply drill bit2, ... Best steel made 3, One set drill bit can use at least 3 months.4, Package ... 50mm, 55mm, 60mm65mm, 70mmBesides, we have chiesel bit, button bit, DTH bit.If you need, you can contact us at ...