3011-BT30 /40/50-SLK12 Shrink Fit Toolholder MST Universal Split Shrink Fit ToolholderBT SLK12 split thermal expansion basic handle: 1. Excellent runout accuracy, large torque, short guide angle, standard internal cooling 2. Thermal expansion collet clamping once, firm and stable, easy to load and unload, slender design, suitable for small diameter deep cavity processing 3. The concentricity of the heat shrinkable extension rod + basic handle precision matching combination can reach 0. 005mm, reliable and durable