The KING TONY Flare Nut / Oil Line Wrench, size 12-14 mm, model 19301214, is specifically designed for loosening and tightening oil and hydraulic line connections without damaging the nuts. It features a precise design that completely wraps around the nut to reduce slippage and increase gripping power, with a durable material that withstands high torque and is suitable for automotive, workshop, and professional maintenance tasks.