When your application requires that a hole be punched closer to the leg of an angle, an offset or eccentric die is required. An offset/eccentric die can be used on a machine that has a moveable die block and the proper slug clearance. A minimum of 1/4" wall thickness on all offset/eccentric dies is recommended.
Flat Sided Dies
A flat sided die allows a hole to be punched closer to the gauge line on angle iron WITHOUT a moveable die block. A 1/4" wall is recommended.