P-350 SPRING for Amberola 30, Victrola, Brunswick, Silvertone, etc. motors: 1″ wide, 3/4″ center arbor, both ends have pear shaped holes. Pear holes have max 3/8″ diameter. Spring thickness is 0.0245″. In 3-1/4″ coil, fits into as large as a 4″ canister. Though the length was not specifically mentioned, the spring was made for the Amberola 30 motor and should be approximately 12 feet long. Please note: Springs are NOT returnable. Extreme caution must be used when working with mainsprings! Not responsible for damages or accidents!