Features: Crafted with premium alumina abrasives, these grinding wheels deliver exceptionally hardness and wear resistance for efficient materials removal across wood, ceramics, and craftwork polishing applications. The set includes three versatile shapes (15mm large cylinder, 10mm small cylinder, and 10mm T head) designed for precise detailing and bulk grinding tasks with vibrations reducing balanced construction. Ideal for professional craftsmen, DIYer enthusiasts, and jewelry makers requiring reliabled rotary tool accessories for intricate carving or surfaces refinement projects. Perfectly adapts to workshops, home studios, and artisanal spaces for polishing gemstones, restoring ceramics, or shaping resin crafts with rotary tools like drills and engravers. Engineered with heat resistant metal cores and optimized grit distribution, these polishing stones maintain consistent performances during prolonged high speed operations while ensuring user safety. Specifications: Component: Metal + Stone Size: Mixed size Package Includes: 18pcs/42pcs Grinding Heads note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.