Gun reamer（RG301 welded type）
Better cutting edge material and structure apply for finish machining high length-diameter ratio.
Multi edges and materials can apply for various machining situations.
Cutting edge runout 0.003mm.
PCD and carbide both are alternative.
Good tool durablity.
Design of welding PCD and Clamped inserts are both alternative.
Support regrinding servide. Make it be more economical.