1. Made of carbon steel material with quenching process, high hardness and durable to use.2. Black oxidized treatment for corrosion resistance.3. The top of the handle has a hole that can be used with a rod to be T handle for added torque.4. Used for CNC Router Engraving Milling Machine Lathe Chucks.Specification:Material: Carbon SteelFinish: Black OxideSquare Size: 12mmHole Diameter: 13mm / 0.51-inchTotal Size: 24mm x 125mm / 0.94-inch x 4.92-inch (D*L)Package Content:1 x Lathe Chuck Key.
eBay