RCBS #90263. The RCBS Trim Pro Case Trimmer 3-Way cutter is a unique three blade head configuration that trims cases like a standard cutting tool but also chamfers and deburrs the case at the same time saving valuable time in the reloading process. This caliber specific pilot and chamfer allow reloaders to change the caliber of their 3-way cutter to work with a variety of different caliber cases. Fits: RCBS Trim Pro 3-Way Cutter heads. 284 Caliber, 7mm pilot and chamfer.