AIR HAMMER KIT 3000 BPM & 5 CHISELS .401SHANK & QUICK CHANGE BIT RETAINER3000 BLOWS/MIN. 66MM HAMMER STROKEAir Hammer Kit with a powerful 3000 blows per minute motor and five chisels, featuring a .401 shank diameter. The kit includes a quick change spring retainer for easy tool switching.