1. Material: Made of Cr-V (Chromium-Vanadium) steel, Cr-V steel is known for its superior strength, durability, and impact resistance2. Instructions: Align the nut driver over the fastener and engage it fully.For installation, simply drive the fastener into the desired location using your power tool. For removal, reverse the direction of your power tool to loosen and extract the fastener.3. Features: The 1/4" hex shank of the nut drivers allows them to be easily attached to power tools, The powerful built-in magnet will securely hold the nut, bolt, or fastener in place on the nut driver, this helps prevent the fastener from falling off during installation or removal.4.