The Astro Tools 78113 is a 13-piece 1/4" drive Low Profile Nano Impact Socket set designed for metric fasteners, which offers a low-profile solution for restricted workspaces. Like the SAE version, each socket measures less than ¾” long (18.5mm), making them 20% shorter than standard shallow impact sockets. For additional versatility, the sockets boast an 11mm outside hex design, enabling wrench use for increased leverage. Crafted from forged Chromoly Molybdenum (CRO-MO) steel with lifetime warranty for unbeatable durability, the set includes a comprehensive range of metric sizes: 4mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, and 15mm. Plus, with a lifetime warranty, you can rest assured that Astro Tools stands behind the quality of this set.