Metric Furniture Screws Flush Threaded Inserts set: 80 pieces Metric Flush Furniture Screws Comes with 9.0mm White steel twist drill and 6mm drive tool. Features of insert nut: These threaded inserts are inserted into a pre-drilled hole by screwing in, in that case the external protrusions bite into the wood, preventing the nut from either turning or pulling out. Flush design permits insert to be installed below surface level. They can keep the two connected surfaces from meeting absolutely flush Suitable application: Easy to install and with good stability, have a good effect in the furniture combination, suit for all Furniture woods of pine, plywood, fiberboard, etc.. How to use: pre-drill/ drill a suitably sized hole and enter with the drive tool. PS?1. The hole depth is 1-2mm longer than furniture screw; 2.If that hardness of the wood material is high, enlarged a little bit the screw hole to fit the screw. Specification: Material: high hardness and high quality carbon steel Size: Furniture Screws: M6 External Diameter:0.410?(10.5mm) Inside Diameter: 0.315?(8mm) Total Length: 15mm. Drill: 9.0mm Drive tool: 6mm Quantity: 80 x Furniture Screws 1 x Drill 1 x Drive tool Note: Small objects and sharp drill bits, please keep away from children