Please see photos. Rare size vintage screw jack. Excellent condition, original finish, works great. Vintage Locomotive Screw Jack I I & B Co. 2x12 Bridge Railroad House Barn Base is 10.5" inches tall, max height fully extended is 21" with it threaded in about 1.5". Approximately 14 pounds. Manufactured by Illinois Iron and Bolt Company in Carpentersville, Illinois.