The Centring piston is the innovative Vacuum 300 core bit centring system.
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The Centring piston is the innovative Vacuum 300 core bit centring system. Suited for diameters less than 112, it maintains efficient dust vacuuming even when inserted in the coupling, i.e. before drilling. The bayonet coupling makes it practical and easy to insert and remove. Remove it from the fitting as soon as the core bit has made the hole, i.e. 0.5/1 cm hole depth, to avoid damage and / or pointless stress.
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