Heavy Duty Air Hammer Kit (Long Barrel) MAX Productivity: Break at lightspeed with the most powerful air hammer available – 15% more powerful to get your job done 15% faster than the leading competitive air hammer.. MAX Control: Feather-able trigger to give you the ultimate control over every job- from jobs that require the lightest touch to the hardest hitting applications, we’ve got you covered.. MAX Assurance: The 135MAX is backed by a two-year warranty, giving you peace of mind that your tool will work when you need it, every time. Includes Quick-Change Retainer, 5-pc Chisel Set & Blow-molded Carry Case. .401 Shank Size. 3 Stroke, 3/4 Bore Diameter, 2600 BPM. Two Year Warranty 135MAXK