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1. Wholly drop forged by tempered and hardened Chrome vanadium steel for strength exceeding international specifications. 2.72-teeth need as little as 5 degree to move fastener while a regular wrench needs 30 degree of sweep space. 3. Finely polished chrome plated and mirror finish will protect against dirt and corrosion for years to come. 4. Flexible ratchet head with 180 degree to swivel, especially designed for tight space. 5. Small head profile. Best application for confined space and car engines 6. All wrenches are clearly marked with the size in four places on two sides for easy identification. 7. Packing: In polybags then in color or white box then outer carton 8. Available sizes are as below: Metric: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25mm. Imperial: 5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 3/4" 13/16" 7/8" 15/16" 1".