Penn ElcomLarge Grill Clamp Kit - Includes Clamps, Screws and T-Nuts - G0780 KIT

Good quality. Well made. Worked perfectly for my project. Gave my spearker a very solid mount. I've used these 3 different times.

The screws easily strip. Where can I buy an extra set of these screws?

If you're looking for heavy duty brackets that can hold down subwoofer speakers these are the ones.

I used this on a RCF 18” driver sub. Hard to find this stuff.

Exactly what I wanted..... matched my other speakers perfectly.....