chinacoal07 Coal Drill Bit

bit,drill bit,drilling bitPackaging & DeliveryPackaging Detail: carton or as the client's requirementsDelivery Detail: 20 days after the depositSpecificationsCoal drill bit have following features: large torque, wide drilling range, easy connection and durableIt is mainly combined with spiral drill shank and works together with coal electric drill machine or portable drill machine.Specification: Drilling Hole Diameter:φ30,φ42Connective Dimension: φ8.5,φ12.5Types: Dry type,