The 1" Chuck Spur will work best for anything of an inch in diameter or larger
Oneway Chuck Spurs are available to mount directly into Chucks made by Oneway
Because of the direct mounting capability, it is unnecessary to remove the chuck from your lathe to do spindle work
Total length is of Spur is 3"
Switch to a spur drive without going through the bother of removing the chuck from the lathe. Just open the jaws, insert the drive and tighten it down.