Features High tensile strength and abrasion resistance, good toughness and hardness, long service life. This rotary tool holder is made of high quality tungsten steel, has a high hardness and is durable in use. Apply when rotating, perfect surface quality, specification and accuracy fully comply with ISO standard. It can reduce tool grinding costs and improve cutting efficiency. Good impact resistance at low temperature, improved surface gloss of cutting parts. Descriptions: This rotary tool holder is made of high quality tungsten steel, high tensile strength and abrasion resistance, good toughness and hardness, long service life. Specifications: Model: SNR0020R16 Material:Tungsten SteelShank Diameter:20mm/0.79\" Total Length:200mm/7.87\" Use: 16IR AG60. Weight: 500 g. Box contents: 1 x rotary tool holder. 1 x insert 16IR AG601 x wrench Package List