30pcs a box with various shapes and have different sizes and thickness to satisfy any technical requirements;
Using engineering principles of design, fashion modeling, security does not hurt for nail polish, removable phototherapy & Crystal nails; To support power tools (eg. grinders / Hanging mill) to use;
Need support by power tools (eg. grinders / Hanging mill, which is not included) to use;
Suitable for wood, metal, glass, jewelry, jade, stone, ceramics, and other surface painting, engraving, grinding, machining, suitable for molds, abrasive industry, machining industry and DIY production.