Using these Bessey ClassiX GSH lever clamps is easy. First, open the clamp by pressing the non - slip trigger release. Place the items you want to clamp between the jaws. Then, release the trigger to secure the items with a strong clamping force. When using, make sure the items are properly positioned to get the best hold. Don't over - tighten the clamp as it may damage the items or the clamp itself. For maintenance, keep the clamps clean after each use. Wipe off any dust or debris. You can also apply a little lubricant to the moving parts occasionally to ensure smooth operation. Store the clamps in a dry place to prevent rusting. With proper use and care, these clamps will serve you well for a long time.