Rockwell RK5142K 4.0 Amp Sonicrafter F50 Oscillating Multi-Tool, with Variable Speed, Hyperlock Clamping, Vibrafree Technology, and Universal Fit System, 33-Piece Kit with Case The F50 features 5 degrees of oscillation for unrivaled fast cutting from a powerful 4.0 amp motor  constant speed wont stall under heavy loads Hyperlock tool-free blade change system provides 1 ton of clamping force  prevents slipping during use, no matter the blade angle Variable speed dial for precision control  from 11,000 to 20,000 oscillations per minute Low-vibration counterweight offsets vibration for a smoother cut Universal Fit System accepts all major brands of blades, sanders, and other accessories