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High quality magnetic stainless steel (alloy 430) discs for Atomic Force Microscopy are offered with smooth edges and consistently flat surfaces. The AFM/STM disks are 20 gauge which is 0.0359" (0.91mm) with a range of 0.0329" to 0.0389" (0.835mm to 0.988mm) thickness. Available in 6, 10, 12, 15 and 20mm diameter, supplied in packs of 50 in a clear tube which will fit into the PELCO® AFM/STM Diskpenser (see below).