- Professional CNC tool for BT30/BT40/BT50 tool holders. This drawbolt key is designed for CNC machine tool holders and features a knurled grip surface that provides a secure hold during operation. The design ensures the drawbolt remains secured after disassembly, making the CNC tool change process faster and smoother. - Premium alloy steel construction. Made from high-strength 42CrMo steel, it delivers exceptional toughness and load-bearing capacity for extended use in demanding CNC environments. The specialized hardening treatment increases hardness and impact resistance, making it a reliable companion for machining tasks. - Non-slip ergonomic design. The thoughtfully designed knurled grip provides excellent control even in oily workshop conditions, reducing hand fatigue during repeated tool changes. This ergonomic feature enables more comfortable operation and minimizes the risk of slipping when applying torque. - Zinc-coated exterior. The wrench features a professional zinc coating that provides a refined appearance along with excellent rust and corrosion resistance. The protective surface ensures longevity in damp workshop environments and maintains functionality over time. Use scenarios: - Use during tool changes on BT30/BT40/BT50 CNC spindles in milling and drilling operations where secure grip and reliable drawbolt retention are critical. - Tool holder maintenance and drawbolt installation/removal in automated CNC cells, especially in oil-prone or coolant-exposed environments. - High-volume machining settings where repeated drawbolt engagement is required, ensuring consistent torque transfer and reducing downtime.