Create a strong, reusable metric thread in wood. These DIYUK M5 x 8mm 4-prong T-nuts (tee nuts, also known as captive nuts, claw nuts or threaded inserts for wood) are made from carbon steel with an anti-corrosion white zinc coating. This pack contains 50 T-nuts.How they work: each T-nut has a metric internal thread in its barrel and a flanged collar with four sharp prongs. The barrel goes into a hole drilled to its diameter; as the nut is driven home, the prongs bite into the wood and lock it against rotation, with no additional fasteners. The collar sits flush with the surface, so the nut is discreet once fitted, and the bolt can be tightened and undone again and again. The internal thread runs the full depth of the barrel, giving the bolt the whole barrel length to engage with.Specification:Thread: M5 metric internal threadBarrel diameter (drill size): 6.2mmBarrel length: 8.0mmFlange diameter: 18.0mmFlange thickness: 1.0mmMaterial: carbon steel, white zinc platedPack size: 50 T-nutsFast installation by hand, without specialist tools. Choose a barrel length that suits the panel thickness, so the barrel stays inside the panel once seated.Typical applications: furniture, including upholstered furniture, table legs, chairs, cabinets and worktops; knock-down and flat-pack furniture; bed frames; outdoor and garden furniture; climbing walls, for bolt-on holds in plywood panels; timber, plywood and MDF structures; workshop jigs and fixtures; and speaker cabinets with MDF baffles. Takes M5 metric bolts, machine screws and furniture connector bolts.Five sizes: M4 x 8mm, M5 x 8mm, M6 x 12mm, M6 x 15mm and M8 x 11mm.