Specification:1. Material: zinc alloy2. Type: Allen screws2. Color: color zinc, adoptive color zinc finish prevents rusting3. Size: M10 25, M8 20, M6 15, M6 10, M5 10, M4 10.4. Quantity: 100 pieces in totalFeatures of the insert nut:1. These threaded inserts are inserted by screwing them into a predrilled hole, in which case the outer protrusions engage the wood and prevent the nut from rotating or pulling out.2. Note: Before installation, first drill a sufficiently large hole with tools. If the material has a high hardness, please try to increase the hole sizeWarm hint:To facilitate installation, please drill a suitable hole before installation, please enlarge the hole if the material is harder.Package contents:30 pieces x internal hexagon (M4 * 10)30 pieces x internal hexagon (M5 * 10)15 pieces x internal hexagon (M6 * 10 )15 pieces x internal hexagon (M6 * 15)5 pieces x internal hexagon (M8 * 20)5 pieces x internal hexagon (M10 * 25)