Contact tips 10 pc. pack Tweco 14H (Heavy Duty) & Lincoln (Heavy Duty) style. Hard Copper, OEM quality contact tips. Use with Tweco and Lincoln Mig guns. 122 DHP Copper - Dimensions: L 1.5" x .280" D 1/4-28 threads. Premium contact tips Tweco 14H (Heavy Duty) & Lincoln (Heavy Duty) style ship the next business day.