The Gray Tools 16-pc Insulated Hex Bit Socket Set, No. 25016-I, features both SAE and metric sizes and comes in a carrying case with a foam organizer. All pieces have dual-layer insulation, providing user protection up to 1,000V in a variety of electrical applications. The set includes seven SAE sockets ranging from 1/8" to 3/8", seven metric hex head sockets from 4mm to 10mm, an insulated 42-tooth round head ratchet, and a 3" extension attachment. Each bit has its size marked for easy identification. Every piece in the set undergoes a multi-step insulation process to meet compliance with ASTM F1505 standards.