Black & Decker Piranha X62125 Pack of 2 Hi-Tech Torsion Flat Head SL 4mm x 25mm Hex Shank Screwdriver Bits

Durable screwdriver bits that have been precision manufactured using latest techniques and quality control systems. 
They guarantee accurate location in the screw-head and allow for high-performance screw-driving. 
Heavy-duty construction. 
Hardened to resist wear and prolong life. 
Suitable for use with power drills and cordless screwdrivers. 
Ideal for screw-driving on wood and metal surfaces.