Off - Low - Medium - High. Clutch circuit is energized in L, M and H. No electrical break between positions. Silver contacts. 7/16” -28 thread mounting stem, 0.34” (8.6mm) long. Five blade terminals. Plated steel case, 1.39” (35.3mm) diameter, 0.50” (12.2mm) long. Black plastic knob with metal insert and set screw , imprinted with SAE arrow symbol.