The screw is made of specially made laminated wood cut into square (round) strips, machined by specialized equipment to produce a round or non round screw with a single oil guide groove or two platforms on both sides, and sealed and supplied after X-ray inspection, oil immersion or dry oil immersion.

Nut: A nut made from laminated wood that has been carved, milled, and threaded by a special machine, and sealed for supply after X-ray inspection, non drying, or oil immersion.