This Multi Utility Bench Pin Combo Set is one of the best investments you can make. It
includes steel ring mandrel standard sizes 1-15, a slotted wooden
bench pin, an oval bracelet mandrel and a flat metal bench block. All of these
attach to the handy clamp on bench mounting system enabling you to work faster
and smarter. Clamp on opening on base: 2 1/4" Bench pin:
6"x2"x.5" Bracelet Mandrel: 6" plus tang (metal portion
that inserts into holder) Ring mandrel: 8.75" plus tang.