Lincoln Welder Oil Drop Knob Set Pipeline Control & Rheostat Fits all 1/2" & 3/8" Shafts on any welder. These are made by me, right here in the USA! 1/4" Steel plate, welded collars, Powder coated black wrinkle with stainless set screws and an Allen wrench for easy install. (Fits below code 8000 or 8823) Works with control switch M11013 (the one with the steel shaft, not the plastic one) This is for Shorthoods, longhoods and Redface welders, Not for Blackface with plastic shaft! The control knob fits 1/2" shaft and the Rheostat knob fits 3/8" shaft. *** PLEASE CHECK YOUR CODE AND SIZE BEFORE ORDERING*** FACEPLATE IN PICTURES IS NOT INCLUDED AND IS FOR DEMONSTRATION ONLY!