Head Specifications: Featuring a spherical, concave head with a diameter ranging from 10-25mm and a shank diameter of 6mm, this diamond mounted point is designed for . The concave arc, smaller than a semicircle, allows for detailed and intricate grinding tasks. Versatile Applications: Ideal for a variety of materials including jade, amber, stone, and beeswax, this tool excels in forming and grinding spherical beads. It produces clean, accurate beads with minimal chipping, enhancing the quality of your craftsmanship. User-Friendly Design: Compatible with both bench drills and hand drills (not included), this grinding bit operates optimally at a speed of 2000-3000 rpm/min. Its electroplated diamond boasts high hardness and excellent wear resistance, ensuring durability and efficiency. Enhanced Performance Tips: To achieve the best results and extend the lifespan of the mounted point, always use a lubricant such as water or cutting fluid. This cools the workpiece effectively, reducing wear and tear on the tool. Maintain low drill pressure and frequent lubrication for optimal performance. Stable Operation: The chamfered round shank of this diamond mounted point ensures easy clamping and a stable working process. This feature prevents slippage and enhances control, allowing for smoother operation and better handling during extensive grinding sessions. Color: Silver Material: Metal Specification: 6x20mm Package Contents: 1*Bead Coarse Grinding Bit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.