3/8" drive 6" extension
The image depicts a vintage S-K 3/8 drive speed wrench, model number 45161. Here's some information about it: Type: Speed wrench, also known as a speeder handle or crank handle.Drive Size: 3/8 inch.Brand: S-K (now known as SK Professional Tools).Model Number: 45161.Material: Likely steel with a knurled handle for grip.Function: Designed for quickly tightening or loosening fasteners. The free-spinning handle allows for rapid rotation.Vintage: Dates back to the mid-20th century, possibly the 1940s-1960s, given the S-K logo style.Manufacturing: Made in the USA.