About 5mm wide and 15mm long, including the open loop ends. The male end screws into the female end. Our new barrel clasps are slightly different from our old -- less tapered toward the loops, and you'll need to close the loops (which you probably had to open on the old ones anyway!).
114 River Street, Montpelier, VT 05602 Email:mail@beading.com | Customer service: 1 800 338 2162 Order by phone: 1 800 338 2162 | Order by fax: 1 802 223 4044