Impact Hammer Drill, Hydraulic, Hydraulic System Type Open or Closed Center, Shank Type SDS Plus, RPM @ 5 GPM 894, RPM @ 6 GPM 1073, Impacts Per Minute @ 5 GPM 4202, Impacts Per Minute @ 6 GPM 5043, Drilling Capacity Concrete 3/4 In, Drilling Capacity Steel 1/2 In, Drilling Capacity Wood 1-1/6 In, Drilling Capacity Core Bit 3 In Core, Pressure Port 3/4 In SAE O-Ring, Return Port 3/4 In SAE O-Ring, Recommended Hydraulic Flow 8 gpm, Recommended Filtration (microns) 10