Din 931Hex bolt have hexagonal heads and machine threads for use with a nut or in a tapped hole. Many din931 hex bolts are held fixed in place during assembly, either by a tool or by a design of non-rotating bolt, and only the corresponding nut is turned. Din931 Hex Bolts allows you to drill take down smaller holes into wood that is far larger than the hole that you would be able to drill on your normal driver. This is perfect for those times that you are working in areas where the woods are not so dense. You will be able to easily take down smaller holes.