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TCT Tapered Plug Making Plug making cutter producing a tapered plug to be driven in and tightly secured. To avoid cutter deflection use this TTTPC range of cutters only on Pillar Drilling machines and do not exceed 3,000 RPM. Feed evenly into material. DESCRIPTION Plug making cutter producing a tapered plug to be driven in and tightly secured. To avoid cutter deflection use this TTTPC range of cutters only on Pillar Drilling machines and do not exceed 3,000 RPM. Feed evenly into material.