Permits proper installation of 6x9 speakers in Harley 5x7 speaker lids that have electric locks | A gnarly job made simple, and speakers will mount securely with no vibration to detract from your listening pleasure | Compatible with 2014 and later Street Glide, Road Glide, Ultra Glide, Electra Glide, and Road King motorcycles | No additional adapter required, this is what you need to do the job right | Lid modification required; cut basket, grind, drill mounting holes; well within the ability of most Harley riders | Made in the USA and built to last