Renishaw M2 Starter Kit (9 Piece)   Contents: 1. 1mm Ruby- 20mm Length 2. 2mm Ruby - 20mm Length 3. 3mm Ruby - 20mm Length 4. 4mm Ruby - 20mm Length 5. 1mm Ruby - 10mm Length 6. 0.5mm Ruby - 10mm Length 7. 20mm Extension 8. 10mm Extensi