Billiard Original Carbon Extension CNC Machined Lightweight 21cm Compatible with MEZZ 1 piece Brand new, unused This product is CNC (Computer Numerical Control) machined and features an aluminum alloy joint screw. Unlike the screws of other extensions, it is not fixed with plastic or adhesive, allowing for a more secure and stable attachment. 21cm Tightened securely with a hex wrench. Instant purchase OK