... .They are mainly used on different metal and non-metal substance surface polish.Specification: diameterhardnessdiameterhardnessinchmminchmm4×1100 ... ×1400×255P16×2400×505P7P7P9P9P12P12P9P9P12P12PUsage:Metal wares, Stainless steel wares; building metal ware; metal watchband, lamps and lanterns ... speed, good brightness, excellent grinding effect, durable for using, convenient to use.Attentions:1.The ...