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Left Hand Counter Sink TCT Designed to fit metric boring bits with 10mm Shank. Suitable for 'V' point drills, Lip and Spur and most dowel drills. DESCRIPTION Designed to fit metric boring bits with 10mm Shank. Left Hand or Right Hand rotation. Suitable for 'V' point drills, Lip and Spur and most dowel drills. TTMBC4/10 for fixing onto the Shank section, for drill diameter 4-10mm. TTMBCF range for fixing directly onto the Flute section.