This M8 T-Nut takes an 8mm dowel screw and is used to fix wooden legs and castors to furniture. Available free of charge with sets of wooden furniture legs from Heritage Upholstery Supplies. If you purchase a set of wooden legs from our site you will receive T-Nuts free in your package. An ideal solution for securely fitting legs and feet to your chairs, sofas, beds and other furniture. The standard fitting in the furniture industry.