For collet choice, when using our 'centre through' type Mini-Mini chuck option, we can provide two main options. A mechanically sealed collet (VMK) for cutting tools which feature a coolant hole and also an alternative 'jet' type collet (VMK-J) featuring three 'V' form grooves down the main bore to supply the coolant down the outside of the cutting tool. Both of course are very effective in swarf removal and placing the coolant exactly where it needs to be!