Set of (8) HiFi Vector heavy duty speaker and subwoofer mounting hex head bolts with 3 prong nuts.
 
We offer 3 sizes please select the size you need for your desired hole diameter and box baffle thickness.
 
The 10-32 are super heavy duty and require a 1/4" hole to mount the 3 prong Nuts. If you don't have that much clearance between your sub and the screw hole you can use the smaller 8-32 size that only require a 13/64" hole.