Used to make large holes in glass beads, rings, sculpture, or core formed vessels. The total length is 12". The large diameter stainless head is 2" long, and is cored out 7/8 of its length to make it lighter. The 5/32" diameter handle allows quicker rotations and makes marvering easier than if the whole tool were the same diameter. Also, unlike tubing, you do not have to worry about moisture getting trapped in the handle and burning you. Available in 7 diameters.