A string trimmer, also known as a weed whacker or strimmer, is a garden power tool that uses a rotating monofilament string to cut grass, weeds, and groundcover, especially in areas a lawn mower can't reach. 

• LST201 is a 10” string trimmer and the LST320C is a 12” string trimmer. The LST320C uses a more powerful motor to swing the longer line.
  
  The LST320C will feel more powerful and will accomplish more work, faster with the larger cutting area.
  
  RPM for the LST201 is 9,000 RPM and 6,200 RPM for the LST320C, but given the difference in swath length, an exact comparison won't be accurate.