Marshalltown M620 Twisted Nylon Masons Line White 285ft The Marshalltown M620 masons line is used to create straight lines and a level surface when laying out posts, patios, footings and more. It has been heat set for increased stability and remains unaffected when in contact with mortar, oil, mildew or water. Features: Heat set after winding to stabilize Not affected by mortar, oil or mildew, will not absorb water For staking out sites before concreting, landscaping or laying bricks and blocks Specification: Line Length:87m/285ft Core: 4� (100mm) Colour: White