Two adjustable straps secure large speakers with 12" - 20" circumference. | Two adjustable straps secure around 4.5" - 7" circumference railings, bars, frames. | Non slip material prevents speaker from slipping. Half inch padding cushions speaker and prevents rattling. | Great for UTVs, golf carts, wakeboard towers or anywhere else you'd like to secure a speaker. | Includes (1) strap.