HSK63 SLK Heat shrink handle Basic Toolholder HSK100A SLK Heat expansion hot-fit split sintered ToolholderHSK SLK Series Split Heat Shrinkable Toolholders 1. Overall Finishing Bore Grinding Inherently strong and long lasting wear resistant, after the bore grinding treatment for high precision machine tools, high machining accuracy, extend the service life of the shank. 2. Slim design Deep cavity machining Thermal expansion collet once clamped, firm and stable, easy to load and unload the slender design, suitable for small diameter deep cavity machining.