... high penetration rate. Our bits are interchangeable with Atlas Copco’s COP32 34 44 54 64 84, Ingersoll-Rand ‘s DHD3.5 ... ,DHD3.5HD,DHD 340A , DHD350R, DHD 360, DHD380 QL40, QL50 , QL60, QL80.Product features: DTH hammer bits are designed ... for maximum performance and hole cleaning ability.High penetration rate,bit after bit ...