Craftsman 3/8" Drive Air Ratchet 191171. 1/4 Air Inlet. Fast Free Shipping. The Craftsman 3/8" Drive Air Ratchet 191171 is a high-quality air tool with a maximum speed of 160 RPM, suitable for various automotive tasks. Made in Taiwan, this air ratchet features a 3/8" drive size and a 1/4" air inlet for optimal performance. With fast and free shipping, this Craftsman air ratchet is a reliable and efficient tool for mechanics and DIY enthusiasts looking for precision and ease in their projects.