This Craftsman flare nut wrench set SAE works on aluminum， copper and brass hexagonal fittings and features a traditional flat design with a wide profile for greater leverage. These alloy steel wrenches come in a handy storage case for corrosion protection and organization， while covered， they're tools you can count on to perform for life. The flare nut wrench set SAE is indispensable for brake line jobs， fuel line maintenance， mountain bike suspension service and appliance repair. Headlock box ends spread turning force throughout the entire fastener to prevent rounding， while the oversized wrenching surface boosts this effect for less wear and tear on your equipment. A solid addition to any kit， get your hands on these wrenches and get things turning right.