Hexagonal Nuts with High Precision Threaded Insert. Allen keys included for easy installation. Wood threaded nuts are excellent for assembling furniture and working with wood. Material: carbon steel. Surface treatment: Galvanized. Head type: internal hexagon. Internal thread: M6 M8 M10. Quantity: 210 wood inserts + 3 Allen keys. Packing list: 10 Pieces x M10x25, 12 Pieces x M10x20, 20 Pieces x M8x25, 24 Pieces x M8x20, 24 Pieces x M8x15, 20 Pieces x M6x20, 50 Pieces x M6x15, 50 Pieces x M6x10, 3 Pieces x Allen keys. Reminder: 1. Pre-drill the hole, then install the insert nut and determine its size. 2. The depth of the pre-drilled hole should be as deep as the length of the inserted nut and the depth of all parts of the bolt that can rotate beyond the end of the nut. 3. When tightening the nut, wood glue can be applied to the outer teeth to improve the tightening effect. 4. When inserting the nut into the plate, both sides can be clamped with a vise or pliers, which can effectively reduce cracks.