With the Spax 4 x 20 mm chipboard screw, you achieve secure and completely flush wood fastenings with ease. The T20 drive ensures optimal torque transmission and prevents bit slippage, giving you full control during insertion. Its countersunk multihead sinks smoothly into the timber for a clean, splinter-free finish without requiring pre-drilling in softwoods or chipboards. The full thread design delivers maximum pull-out resistance and firm clamping force, making it ideal for furniture assembly, securing thin sheet materials, or mounting metal fittings. Finished with a Wirox coating, it offers dependable corrosion protection and surface hardness for indoor projects.