3-pack Neutrik Long-shaft 1/4" Mono Guitar Jacks Longer 9.5mm threaded shafts for thicker panels 1/4" mono phone jacks work with standard amp cords Great as output jacks on guitars and other instruments, and input jacks on amplifiers Longer shaft great for Cigar Box Guitars (reach through thicker wall panels) High-quality Neutrik/Rean-brand jacks