Features:1 Chrome vanadium steel forging: The product is forged by chrome vanadium steel, which is durable and wear-resistant 2 Overall heat treatment: Overall induction hardening, increase product hardness and prolong service life 3 General hexagon handle: The handle diameter is 6 35MM (1/4 inch), which is a standard hexagon handle 4 Easy installation: There is no need for other tools to install the product, just takes a short time to finish the installation 5 Safety: Made of safe materials, environmentally friendly, non-toxic, tasteless, and harmless to humans Description:The Hexagon handle screw socket wrenchs are forged by chrome vanadium steel, durable and wear-resistant Specifications:Material: chrome vanadium steel forgingDiameter (mm): 3/16, 1/4, 9/32, 5/16, 11/32, 3/8, 7/16, 5, 5 5, 6, 7, 8, 10, 12 OR 5, 6, 7, 8, 9, 10, 11, 12, 13 (optional)Uses: screw tightening, dovetail screws, etc Package Included:9 pcs * hexagon handle screw socket wrenchs14 pcs * hexagon handle screw socket wrenchs(optional)