Features: • Most complete AldenWrench Set in bigger sizes to 19mm • Combined with same size open end wrench to measure fastener accuracy • Sizes include: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm and 19mm 17-4 Stainless Steel resists corrosion; No chrome nor cadmium plating • Sold with customized rack The Alden Wrench ProPack Set was designed for the professional technician. It has evolved through years of use and feedback from professional mechanics. Each wrench has two heads of the same size. On one end is the Alden 30 degrees open ratchet and the other head is a regular open wrench. The purpose of the open end is to break loose an overtightened or frozen fasteners, although, in most cases, the AldenWrench ratchet head gives more than enough torque to open normally tightened fasteners. Secondly, to measure the size of the fastener prior to attempting to use the Alden ratchet.These fasteners once loosened can be removed with the speed of the AldenWrench open ratchet. AldenWrench and Open End wrench metric from sizes 10mm-19mm.