Silicon Carbide Grinding Stones Designed to work well on stone, glass, ceramics, porcelain and non-ferrous metals. Ideal for sharpening, deburring and general purpose grinding on harder materials including stone, glass, ceramic, porcelain, gemstones and non-ferrous metals. Specially designed for working with conic and flat surfaces.   User Tips Always remember to have a spare battery pack charged up so you don't have to quit working to recharge your battery and keep your cordless rotary tool charged up and ready to go. For best results, insert the accessory bit all the way into the tool and then back it out slightly before tightening down. This provides plenty of shank for the collet or chuck to hold onto the bit     Specifications for 84922 Shank diameter: 3.2 mm Working diameter: 4.8 mm Maximum Speed: 25,000 rpm Quantity: 3 Order number: 26154922JA   Specifications for 83322 Shank diameter: 3.2 mm Working diameter: 3.2 mm Maximum Speed: 25,000 rpm Quantity: 1 Order number: 2615332232   Specifications for 85422 Shank diameter: 3.2 mm Working diameter: 19.8 mm Maximum Speed: 25,000 rpm Quantity: 1 Order number: 2615542232   Specifications for 85602 Shank diameter: 3.2 mm Working diameter: 10.3 mm Maximum Speed: 25,000 rpm Quantity: 1 Order number: 2615560232   Specifications for 85702 Shank diameter: 3.2 mm Working diameter: 10.3 mm Maximum Speed: 25,000 rpm Quantity: 1 Order number: 2615570232   Specifications for 83142 Shank diameter: 3.2 mm Working diameter: 3.2 mm Maximum Speed: 25,000 rpm Quantity: 1 Order number: 2615314232