Replacement Test Plug Rubber 300mm (12") Somta Series 208 – Cobalt M T No.1 Drill 14.5mm these inserts are part of Best Carbide SG3M 9.5mm Double Cut Metric Carbide Burr these inserts are part of the CoroTurn 107 system and feature a positive geometry for low cutting forces and smooth cutting action providing a reliable reference standard for calibration The Twin Eagle Imports Replacement Test Plug Rubber is a precision engineered rubber seal designed as a direct replacement for 300mm (12") test plug assemblies Twin Eagle Imports supplies professional grade plumbing and drainage accessories for trade and workshop environments across Australia