Made in the USA - Our swivels are strong, sturdy, and reliable - Popular for bar stool & chair applications - 6.75"x 6.375" top plate w/ 3 degree angled pitch - 6.375" round bottom plate w/ four 1/4-20 threaded mounting holes Top plate mounting holes are 0.75" long oval shaped slots & accommodate most 5.25", 5.5", & 5.875" mounting screw patterns (mounting hardware not included) Bottom round plate mounting holes are 2.5" square - Featuring full 360 degree rotation on pre-lubricated ball-bearings - Steel - unpainted finish - Note: Each swivel needs 25 - 30 lbs of weight applied in order to attain normal swiveling rotation. They are not meant to rotate freely when handled individually and may be difficult to rotate before installation. This is normal to avoid too loose of a rotation when in use.