The 116.311 is used primarily for cleaning metal and preparing metal for finishing and polishing. Local jewelry schools here in the San Francisco Bay Area use it in wet environments. You can leave it in a bucket of water and the handle won't disintegrate.
Previous versions that are no longer available used Lucite handles.
Has four rows of .003" brass wire. Overall length is 7-1/4" Brush 3-1/4" long by 3/4" high.