SL91900 Features: -This specialty socket has been designed to open and close most radiator drain plugs that have thumb wings. -In operation, this unique socket snaps on a 3/8" square drive extension allowing it to reach into confined areas. -Socket has a double slotted end that captures the thumb wings in order to turn the drain plug open or closed. -Radiator Drain Plug Socket. Product Type: -Parts & Accessories. Use: -Cooling System. Quanitity: -Single. Dimensions: Overall Height - Top to Bottom: -0.7 Inches. Overall Width - Side to Side: -5 Inches. Overall Depth - Front to Back: -8.5 Inches. Overall Product Weight: -0.05 Pounds.