The Gilchrist Precision Choke Reamer is designed for precise cutter to bore alignment and is used to fine-tune choke size or remove chokes for screw-in installations.
It requires the Gilchrist Handle and two Clymer Choke Tooling Bushings for operation, which must be purchased separately.
It is suitable for 12 and 16 Gauge cartridges and the reamer's expansion range for a 12gauge "D" is .656" - .718".