Astro Pneumatic Nano Ratchet 3/8” Drive Head in 1/4” Ratchet Body Long 93812 The Astro Pneumatic Nano Ratchet 3/8” Drive Head in 1/4” Ratchet Body Long 93812 is a 3/8” drive ratchet in a 1/4” ratchet size format. The Nano 3/8” head is 50% the size of the most popular 3/8” competition and the same size as the 1/4” drive. 72 tooth, 12” long, quick-release socket retention, solid teardrop handle, and a full chrome polish finish. The 3812 Astro Pneumatic Nano Ratchet 3/8” Drive Head in 1/4” Ratchet Body Long exceeds ASME torque standards for 3/8” drive tools despite its miniature size.