General description Designed for processing pearl beads, this 150 Pieces Ring Drill Bit Set allows you to create your own DIY crafts, home decor, and more. Each ball produced is nearly perfect, requiring only minimal sanding or polishing afterward. It is suitable for various types of wood, including ebony, rosewood, mahogany, and more. Technical specifications Material: Metal Color: Silver + Gold Blades Sizes: 16mm, 17mm, 18mm, 19mm, 20mm, 21mm Package Contents: 5 x Handles, 30 x Blades, 100 x Drill Bits, 5 x Wrenches, 10 x Screws Measurement allowed error: +/- 1-3 cm Other information Note: Light reflection and different displays may cause the color of the item to differ slightly from the actual product.