... -woven nylon grinding wheel(square hole) 2.Advantage:sharp,durable ,stable and economical Made of Silicon Carbide, imported resin and polishing fiber and ... , such as wood, plastic, glass, stone, etc.Normal Specification:nylon grinding wheelsdiameterhardnessdiameterhardnessinchmminchmm4×1100×255-7P4×1100×259P6×1150×255P6×2150×505P7P7P9P9P12P12P8 ...