Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great Router Bits

Use these Amanas in a Thermwood Model 42 CNC router and they are great, have tried many other manufactures for the 1"long 3/8" diameter bits and they just don't hold up, the Amana's do. Cutting mostly 1" MDF with two passes at 1/2" each pass at 70ipm