Carpenter-style Side-mount 1/4" Jack Fits All Violins Black with Chrome Plated Fittings Very Sturdy, Built for Stage Use Pickup Not IncludedCarpenter-style jack for use with Fishman violin and viola pickups. Same carpenter jack that is being used in the Fishman V-200 pickups. Fits instruments from about 1-3/8" to 1-5/8" thickness. Includes jack assembly only, pickup not included.Note! This will not work on a mandolin and most violas, you will need to purchase the Mandolin jack assembly, part number ACC-M20-0JA which has longer turnbuckles. Soldering required to connect your existing pickup to the jack, professional installation recommended.