Product Name: DTH Tools Rock Drilling System Drill Bit Model NO.: DTH Button Bit Material: Cobalt Steel Alloys Length: Taper-length Certification: BIN, JIS, AISI, API Customized: Customized Diameter (mm): 28-45 Length (mm): 50-80 Trademark: Enwei Transport Package: Wooden Case Specification: 26mm---42mm Origin: China HS Code: 8431432000 Product Description Introduction of Threaded Tungsten Carbide Button Drill Bits for Quarry/RockkingDTH Down The Hole Drilling Hammer Bottom Bits are made from grade hard alloy and special steel, generally matched with the light-duty rock drill, to drill the rock hole within diameter of 50mm.DTH Down The Hole Drilling Hammer Bottom Bits have two flushing holes and are available in three flavors: Flat, Convex and Concave. These Down The Hole (DTH) bits fit the most popularDTH hammersuse in water welling, mining, construction and quarrying, metallurgy mine, geological exploration, water conservancy construction, electricity, traffic, tunnel, quarry, national defence stone project etc,.Parameters ofThreaded Tungsten Carbide Button Drill Bits for Quarry/RockkingTaper DegreeDiameter (mm)Length (mm)7°(6° 11° 12°)2850-807°(6° 11° 12°)3050-807°(6° 11° 12°)3250-807°(6° 11° 12°)3450-807°(6° 11° 12°)3550-807°(4.46° 6° 11° 12°)3650-807°(4.46° 6° 11° 12°)3850-807°(6° 11° 12°)4050-807°(6° 11° 12°)4150-807°(6° 11° 12°)4250-807°(6° 11° 12°)4550-80