Check the listing for details. 30Pcs Circular Head 1/8" Mini Diamond Coated Spherical Grinding Bits Ball Burs. Condition: New. Listed at 13.80 USD. 30Pcs Diamond Coated Grinding Burrs Set Grit 150 Rotary Point Shank 1/8 inch Code 6#-3mm New one box set of 30 Pcs diamond coated grinding burrs / pointed heads in box set Specifications and shapes: Product Name:diamond grinding head set for dremel, diamond grinding bits 1/8, diamond burs Heads Shapes: Sphere,Ball burs Heads diameter: 3mm Total Length: 45mm (1 3/4" inch) Shank diameter :3mm Grit :150 Medium They will fit your hand drill, drill press with a 3mm collet. There are two different collet sizes with Dremel: 2.35mm (3/32 inch) or 3mm (1/8 inch). If your chuck of Dremel is 2.35mm (3/32 inch), then the grinding bit can be installed and used directly. Because the shank diameter of grinding bit is 2.35mm (3/32 inch). If your chuck of Dremel is 3mm (1/8 inch), maybe you need add the Adjustable Chuck (Multi Keyless Universal Quick Change Chuck Rotary Tools Accessories for Dremel) Premium type diamond coated, More durable than the ordinary diamond coated burr. Use with water as a lubricant is better Suitable for use in grind the edge of glass, marble, rock or jewelry. And apply to drilling glass, shells, tile and stone. We will send out your order within 1-2 days after payment has been received and cleared. Welcome to Visit My eBay Store: Jewelry Tools 1