1.Fiberglass mesh 2.Advantage: heat-keeping, dielectric, corrosion-resistance 3.reinforce cement, plastic, bitumen, ... exterior walls and in other industrial applications.Heat-keeping good flexibility good tenacity dielectric,heat insulation.Yarn type: e-glass & c ... to acid, alkali, crack, light, hard to shape, waterproof, heat-keeping, dielectric, flat surface, longtime-using, and etc.2>hole: 5mm ...