The video shows a close-up of a metal bolt with a blue substance being applied to it. The substance is being applied with a brush, and it is being spread evenly across the surface of the bolt. The bolt appears to be made of steel and has a threaded shaft. The blue substance is likely a lubricant or sealant, which is commonly used to prevent rust and corrosion on metal parts. The brush used to apply the substance has a red handle and blue bristles. The background is blurred, but it appears to be a workshop or industrial setting.