We manufacture DTH Hammers in different sizes ranging from 1 to 12. These hammers are made corresponding to Drilling Bits to carry out prevalent objectives. These hammers are used in various down the hole operations like bench Drilling. These are valve less hammers with optimized air cycle frequency. These are heavy duty hammers that well at greater depths demanding less air usage, delivering minimum performance loss. We offer IR hammer, DHD3.5, DHD340a, DHD360, DHD380,COP and QL hammer.The optimum range of hole size for blast drilling with DTH is 90mm to 254mm,smaller blast holes are generally drilled using top hammer, and larger holes generally use rotary machines. Our hammer like COP and QL are known fort heir reliability and longevity. Specification: External Diameter (mm) Connection thread Hole rang (mm) Low air pressure DTH hammer CIR type 50~180 CIR** 55~200 Middle air pressure BR & COP type 70~110 85~115 3 inch DTH hammer COP34/QL30 etc 81 API 2 3/8” Reg 90~110 4 inch DTH hammer COP44/DHD340 etc 99 API 2 3/8” Reg 110~150 5 inch DTH hammer COP54/Mission50 etc 125 API 2 3/8” or API 3 1/2” Reg 135~165 6 inch DTH hammer COP64/QL60 etc 142 API 3 1/2” Reg 152~216 8 inch DTH hammer COP84/SD8 etc 180 API 4 1/2” Reg 203~305 10, 12inch DTH Hammer NUMA 100, NUMA 125 275 API 6 5/8 Reg PIN 305-445 1-12 inch middle-low/high air pressure DTH hammer & bit Big hole high air pressure DTH hammer using in water well, oil, gas and construction drilling Eccentric overburden drilling Equipment Hole opener bit Rock thread bit Shank adapter, coupling sleeves and all kinds of adapters Advantages: Compared with the oversea brands, our advantages are bellowing: a. Our products can match over 95% against the original products b. Price are competitive against the famous brands and best quality against the small factory