Park Tool SG-8 Saw Guide for Carbon Forks
The SG-8 is built around the same specs as Park Tool's standard fork saw guide with the exception that the width of the saw slot is increased to accommodate the larger carbon-specific blades.
The clever design features a extended tab the securely locks in to a vise. Rubber clamp will not mark up or damage the fork when securing the steerer tube in the guide. Clearly the best design to date for cutting steerer tubes and a shop standard by anyone's measure.