-1/4" capacity with solid bits 3-1/8" capacity with core bits Optimum drilling range 3/8" - 1" No-load RPM rating of 1150 4470 BPM 3.1 Joules Impact energy Unique vibration dampening system Lightweight - less than 7 lbs. Easy to use 3-function switch Easily select between impact drilling rotary drilling (non-impact) and 12 position chipping function Variospeed (V) Full-wave Electronic Speed Control Unique Anti-Vibration system Oversized ergonomic trigger switch The 360 degree vibration dapened side handle - increase operator safety