Founded in the 2000s, Jetech boasts a comprehensive range of tools with a strong focus on professional industrial-grade tools. We take pride in serving mechanics and users from over 60 countries and 5 continents. Jetech 7pcs combination gear wrench set is made with forged, heat-treated, and sandblasted chrome vanadium steel. Designed to meet high industry standards, this wrench offers excellent strength and durability. Chrome plating provides rust and corrosion prevention. A powerful 72-tooth ratcheting mechanism achieves working in tight places with a 5-degree swing arc needed to start. 12-pointed box end ensures the fasteners be gripped securely on the sides, thereby prevents the vertices from being rounded or stripped. Choosing the right size of your wrench ensures the highest working efficiency and protects the fasteners. Metric Size: 8mm, 10mm, 12mm, 13mm, 14mm, 17mm, 19mm.