90 Degree 3MM Pneumatic Micro Grinder Angle Air Die Pencil Polisher Tool

Feature: Quick lettering use for flexible and comfortable. Pen needles is made of special alloy steel good durability. Depending on the difference of material to decide the depth. Works great on metal wood plastic glass stone porcelain and other hard material. This configuration is great for marking tools parts and more. Specification: Name: Pneumatic Grinding Pen Material: plastic + Alloy steel Length: 143mm Chuck size:3.0mm Air inlet thread: 1/4-28UNF Free speed: 70000 rpm Air pressure: 90psi