Made especially for grinding on hard steel, ceramics, glass, and other hard materials, For use with Single-Speed MultiPro Rotary Tool #275 (2561-4231), Two-Speed MultiPro Rotary Tool Kit #2850-02, Variable-Speed MultiPro Rotary Tool #395 (2615-3726), Digital Rotary Tool #398 (2561-4405), MiniMite Cordless Rotary Tool #750, For use with , 13"" collets #480 (2615-4112) and #585, 13"" shanks, 13/32"", Carded, Length: 4, 4, Width: 2, Height: 4, 1 SKU: JNSN7758