Using your Klein Tools 32476 5-in-1 Multi - Bit Screwdriver and Nut Driver is easy. First, check the marked end of the handle to pick the right bit for the job. Simply insert the bit into the screwdriver. When using it, hold the Cushion - Grip handle firmly. It gives you more torque and is comfortable to hold. For nuts, use the 5/16 - Inch nut driver. For different screws, choose from the #1 and #2 Phillips or 1/4 - Inch and 3/16 - Inch slotted bits. When you're done, keep the screwdriver and bits in a dry place. If a bit gets worn out, you can buy replacement bits. Just make sure to use the correct part number like 32478 or 32479. Avoid using this tool in wet or high - voltage areas as it's not insulated. Also, don't use excessive force that could damage the bits or the tool. Regularly wipe the tool with a clean cloth to keep it in good condition.