HIGH PRECISION 1PCS 7/32" ER20 COLLET TIR 0.0004" / 10μm CNC ER20 TOOL HOLDER

Concentricity is less than. 0004" at face and arbor (TIR). All critical surfaces precision ground. All critical surfaces are precision ground for accurate fit. Run out: 0.0004" / 10 μm. If both quality and cost are your first concern.