1156-Small Bore Boring Tools Boring Tools Small Boring Tools Small Boring Tools Small Diameter Boring Tools Precision Boring Tools Boring Heads Internal Bore Tungsten Carbide Boring Tools ToolsSDJ Fine Boring Bars Deep Hole Machining Vibration Resistant Tungsten Carbide Material 1. High hardness tungsten steel base material eight times stronger anti vibration The patented structure of high hard tungsten steel + boring head has good anti vibration performance and is not easy to shock the cutter. 2. Seamless Strong compression force Screw type compression structure, the most stable form of compression, easy to disassemble, full compression