Carmex Tiny Tool Holder - Square Shank Holder to hold Carbide Small Boring Tool - 3mm Bore x 12x16The Carmex Tiny Tool Holder, now in a square shank design, is built to securely grip carbide small boring tools (Tiny tools) for precise, repeatable machining. Its compact form fits into tight spaces while the square shank reduces vibration for longer tool life and higher efficiency. Square shank design: specifically engineered to hold carbide tiny tools with a secure, reliable grip. Bore size: 3 mm bore for small carbide tooling. Tool type: designed