Features Specifications: The boring head shank has standard 1‑1/2‑18UNF thread, 0.005mm accuracy, and 60 degree angle, ensuring accurate milling operations. Easy Installation: The boring head shank has a compact size, allowing for easy installation and disassembly, and quick switching between applications. High Carbon Steel: The R8 arbor adapter is made of excellent high carbon steel, with high hardness, wear resistance, and has a long service life. Comfortable Grip: With exquisite workmanship, the end mill tool holder has a glossy appearance, ensuring comfortable grip and improving work efficiency. Wide Application: The boring tool shank is widely used for machining inner hole surfaces, boring ends, cutting holes, etc., which is compact and practical. Specification: Item Type: Boring Head Shank Material: High Carbon Steel Thread: 1-1/2-18UNF Accuracy: ≤0.005mm Type: Milling Tool Package List: 1x Boring Head Shank 1 x Storage Box Package List 1 x Boring Head Shank 1 x Storage Box