This pin should work with any standard-sized lapel pin clasp (not included).
Note: Depending on the material you choose, the pin may have a somewhat rough texture. The 3D rendering is a representation of the model itself, but the printing process does introduce some texture.
Update 2/8/13: The size of the pin has been slightly increased to offer a better fit with standard clasps (it was a hair too small to get a good fit).
1.908 w x
1.082 d x
0.751 w x
0.426 d x