This 3/4in straight handle ER20 collet chuck tool holder is designed for use with TTS tool racks and CNC machines requiring accurate and repeatable tool positioning. With a gage length of 1.38 inches, it provides a compact and rigid setup suitable for milling, drilling, and engraving operations. 3/4in Straight Shank: Standard 3/4" straight handle fits a wide range of CNC spindles, collet chucks, and tool holders for versatile use in machining setups. Specifications:Model: ER20;Chuck Runout (TIR): 0.0003";Neck diameter D: 1.30 inches;Tool rack type: chuck;Clamping range: 3/16-1/2′′;Clamping size: ER20;Maximum balance: 12,000RPM;Shank diameter: 3/4 inches;Flange: 1.5 inches;Overall length: 2.68";Shank length: 1.38;Including chuck nuts Compatible with for TTS Tool Rack: Specially designed for 3/4" shank systems and TTS style tool racks, allowing quick tool changes and organized tool storage. ER20 Collet Interface: Accepts ER20 collets, supporting a variety of tool diameters for milling cutters, drills, and engraving bits, providing high clamping force and stability., Weight: 0.65256829552 pounds, Manufacturer: Ehwisbe