Clamp straight-shank cutting tools with sub-micron runout accuracy and uniform concentric force using Collet Chucks PSC Tool Holders. Precision-engineered for modern multi-tasking machines, turning-milling centers, and high-speed CNC machining stations utilizing ISO 26623 polygon taper spindle connections (PSC), these tool holders utilize industry-standard ER collets to secure drills, end mills, reamers, and taps. The unique self-centering polygon taper interface, combined with a precision-ground internal collet seat, delivers outstanding radial stiffness and vibration-free rotational balance during complex high-RPM milling and drilling operations.