Carmex Tiny Tool Holder - Square Shank Holder to hold Carbide Small Boring Tool - 4mm Bore x 12x16The Carmex Tiny Tool Holder is a squareshank solution designed to securely grip carbide small boring tools (Tiny tools) for precision machining. Its ideal for machinists working in tight spaces and on small components who demand reliable performance and consistent results. Square Shank Design: Provides a secure, reliable grip on carbide Tiny tools, reducing tool slippage during cutting. 4 mm Bore: Specifically sized to hold 4 mm carbide small boring