Feature: 1. OXIDATION RESISTANT CARBON STEEL: Made of excellent carbon steel, quenching and blackening of the surface, with strong oxidation resistant ability, high hardness, and long service life 2. TIME AND EFFORT SAVING: Round die wire allows quick and easy installation and removal, saving your time when switching between applications 3. STABLE AND WEAR RESISTANT: Firmly clamping round die, used for processing or correction of male threads, with good stability, not easy to break teeth, fast edge collapse, wear resistant, long service life 4. SAFE AND REST ASSURED: Strict quality control and quality assurance, bring high safety factor, can rest assured to use 5. WIDELY USED: This high accuracy round die chuck is widely used in tapping machine, drilling machine, milling machine, boring machine, pneumatic tools, etc. Specification: Item Type: Bolt Die Tapping Collet Model: GT12 M8 Material: Carbon steel Interface Outer Diameter D: Approx. 19mm / 0.75in Die Mouth Internal Diameter d: Approx. 25mm / 0.98in Die Mouth Height L1: Approx. 8.5mm / 0.33in Maximum Socket Depth: Approx. 50mm / 1.97in. Package List: 1 x Bolt Die Tapping Collet1 x Hex Wrench