This is a very secure clasp using bolts and nuts to secure the magnets in the clasps.
Made of brass with Electro color plating with clear plastic coat over the color plating to make it last longer.
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