This is a very secure clasp using bolts and nuts to secure the magnets in the clasps.
Made of brass with 10 mils* nickel-free plating in 18KT gold. (* mil = one thousandth of an inch.)
The only glue I recommend for attaching clasps to beaded and fiber braids is 2 part epoxy glue as it is the only glue to forms a secure, permanent bond. Step-by-Step instructions for using 2-Part Epoxy are on my blog http://kumihimoresource.com/kumihimo/2-part-epoxy/
Dimensions: 16mm long
Hole Size: 8mm