The RCBS Trim Pro 3-Way Cutter is automated case preparation at its finest-one of those accessories reloaders can't live without. Its unique three-blade head configuration trims cases like the standard cutting tool, but in addition to trimming to length, inside blades chamfer the case while an outside blade deburrs it. The 3-Way cutter attaches easily to both Case Trimmers and Trim Pros. Note: for 90276 (17 cal) and 90277 (20 cal), the 90251 3-way Carbide Cutter Head Replacement will not support the .17 and .20 3-way chamfer pilots.