Pgmj 200 Pcs. 1/4"-20 Wood Inserts Bolt Furniture Screw In Nut, 20 X20Mm). 1/4"-20 Furniture Screws Threaded Inserts set: 200 pieces 1/4"-20 Furniture Screws Comes with 9.0mm White steel twist drill and 6mm Hex Spanner. 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. 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 an Allen tool screw. 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: Thread Type: 1/4"-20 External Diameter:0.410?(10.5mm) Inside Diameter: 0.315?(8mm) Total Length: 20mm. Drill: 9.0mm Hex Spanner: 6mm Quantity: 200 x Furniture Screws 1 x Drill 1 x Hex Spanner Note: Small objects and sharp drill bits, please keep away from children 200 pieces 1/4"-20 furniture screws threaded inserts for wood furniture. Comes with 9.0 mm white steel twist drill and 6mm hex spanner. Internal thread insert type: 1/4"-20, it is not a metric nut, the thread inside the nut is different, match this type when selecting accessories Material: High hardness and high quality carbon steel Usage: Use the matching bit pre-drill /drill a well-sized hole (depth is 1-2mm longer than furniture screw), then use a proper 6mm internal hex tool to screw in. Tip: If the furniture wood is with high-hardness, please enlarge the screw hole. Applications:These furniture screws are wear-resistant and very durable to use. Suitable for furniture hardwood/ solid wood, for furniture combinations.