This is the most common wheel stud used front and rear of all early Classic Mini and Mini Cooper before the change to wide rear drums. These fit most front disk brake cars too, and allow the use of MOST aftermarket wheels when used WITHOUT wheel spacers.
Overall length 1.5" (35mm). Length of shaft, not counting head, 1.375". Threaded portion approx. .875"
For the wider rear drums, see 21A1278.