Pfanstiehl 809-DS77, N690SD, 868DS, 3224DS, AC340D1, S86XSD, 5955D, W185.  Replaces: Sonotone N21T, N22T, N35T. Used in: Sonotone 21TR, 22T, 23T, 24T, 31TA, 35T, 43T.  Tip Materials: .0007 Diamond. Radii: .0007 Synthetic Sapphire. Speeds: 33 &45 RPM.