Size and fit: H4 (4 mm) hex bit designed to match H4 (4 mm) fasteners and compatible drivers, providing a precise fit for hex head screws. Reinforced grip: Internal hexagonal design strengthens the connection between bit and screw, reducing cam-out and slippage during use. Extended reach: Total length 45 mm for the extended bit gives better access to screws recessed in holes or tight spaces without compromising control. Easy and efficient operation: Simple to install and use; the reinforced geometry maintains stability under torque for faster, more reliable work. Performance focus: Built for consistent engagement and repeatable results when driving or removing H4 (4 mm) hex screws. Typical applications: Furniture assembly and cabinetry where screws sit recessed below the surface. Maintenance and repairs on appliances or equipment with recessed hex fasteners. General DIY and professional tasks requiring controlled access to screws in narrow or deep holes. Key attributes at a glance: Function: Drive and remove H4 (4 mm) hex screws Compatibility: H4 (4 mm) fasteners and matching drivers Size: 4 mm tip, total extended bit length 45 mm Design: Hexagonal internal reinforcement for anti-slip performance Use this bit when you need a precise, stable connection and extra reach for screws located inside holes or confined spaces.