Greenlee Hydraulic Impact Wrench HW1 Impact and temperature resistant replaceable polymer grip designed to dissipate heat from the cast handle Weight reduction of 14% to previous models Improved center-of-gravity for superior ergonomics Increased service life with the addition of back-up rings and larger O-rings Built-in hydraulic check valve to eliminate damage from an improperly connected tool Large and strong lifting eye for easy and secure storage Longer and wider trigger provides improved control with insulated gloves Fast and easy change between open-center systems and closed-center systems with no disassembly required Higher breaking torque in reverse to ensure you can remove tighted bolts Cast motor enclosure that better protects the impact mechanism operation versus competing models with stamped steel enclosure Accessory : NR1 Nut Runner With Adapter For 5/8; 1/2″; 13/16″ and 1.000″ Square Nuts; NR2 Nut Runner With Adapter For 1.000″; 1-1/8″ And 1-5/16″ Square Nuts; 00376 Trigger Guard Kit For HW1 Or HW1V; 49314 Heavy Duty 7/16″ Hex X 1/2″ Square Drive Shank Capacity : 7/16 IN Hex Drive Size : 1/2 IN Flow Range : 4 – 12 GPM (15 – 46 LPM) Handle Type : Impact And Temperature Resistant Replaceable Polymer Grip Height : 11.000 IN Hydraulic System : Super Spool Selector For Open and Closed-Center Systems Includes : 7/16 Hex Quick-Change Chuck And 49314 Heavy-Duty Adapter IN Length : 8.200 IN Operating Pressure : 1000 – 2500 PSI (69 – 170 BAR) Optimum Flow Range : 5 – 8 GPM (19 – 30 LPM) Pressure Port : 9/16 – 18 SAE O-Ring Replacement : 54923 HTMA Male Coupler: HTMA; 3/4-16 SAE O-Ring Exterior Thread; 54925 HTMA Female Coupler: HTMA; 9/16-18 SAE O-Ring Exterior Thread Return Port : 3/4 – 16 SAE O-Ring Torque Rating : 500 FT-LB At 8 GPM (677 N-M At 30 LPM) Maximum; 500 FT-LB At 8 GPM (677 N-M At 30 LPM) Minimum Type : Hydraulic; High Torque Weight : 6.500 LB (2.930 KG) Width : 4.200 IN “