The 6-pc Insulated T-Handle Hex Key Sets from Dynamic Tools include an SAE set with sizes ranging from 5/32" to 3/8" and a metric set with sizes from 2.5mm to 8mm. Each tool features an ergonomic comfort grip handle for easy operation and a secure, non-slip grip. Precision-machined black oxide tips provide an exact fit, and the tip size is marked on the handle for quick identification. Every piece undergoes a multi-step insulation process. Then, each tool is charged with 10,000V of energy for 180 seconds to ensure its insulation resists potential electric shock.