5pc metric extra long box end wrench set are manufactured with high strength chrome vanadium alloy steel which place great value on quality and performance. The aviation double box end wrenches in the set have longer beam and slender shafts with thick ring heads to increase leverage and torque, provide up to 30% more turning power at every turn and twist, and perfect for hard to reach work spaces. The extra long wrench with 12 points provide added grip and contact with the bolt. Long lasting protection, corrosion-resistant mirror high polish finish for durability and easy cleaning, oil and dirt wipes right off. 5pc extra long double box end wrenches with sizes: 8mm x 10mm, 12mm x 13mm, 14mm x 15mm, 16mm x 17mm, 18mm x 19mm, sizes stamped on both sides for easy identification. Comes with a roll package for easy storage & transportation. High Quality Chrome Vanadium Steel Fully Polished Features for easy cleaning and rust resistance Manufactured from chrome vanadium steel for strength and durability Industrial and Automotive Applications The unique ultra-long design can increase the torque, which is easier and more labor-saving than other box wrenches on the market.