Precise Hexagon Key End: Precise hex kay ends for smooth insertion for all types of Allen bolts. Versatile heads that allow up to 9mm of entry. Special Design Screwdriver: These handy screwdrivers make tightening or removing those specially designed bolts for a quick and easy screwing. Versatile Assortment of Sizes: These hex keys set comes in a variety of sizes and quality designs so you can select that best suits the types of jobs your taking. Powerful Tools: The abilities and strength of torque and ratchet makes the job well done. Made of heavy-duty steel makes them highly resistant to rust and heat-treated for strength. FREE SOL NOTEBOOK - An exclusive SOL pocket-sized notebook is included, measuring 8.5cm x 12.5cm and with 40 lined pages! Sometimes known as an alenke set.