Power-Tec 91251 Oblong Hole Punch 8mm x 20mm Features and Benefits: Time saving oblong hole punch for MIG braze plug welding. Size: 8mm x 20mm. Eliminates time needed for drilling holes. Smaller 6mm x 20mm Hole Punch available – please see Power-TEC Part No. 91250. Saves hours of time. Part of the Welding panel repair range.