This authentic pin is made by Geemacher in a high-quality ISO-9002 production facility. It holds 4.5 imperial gallons, or about 5.4 US gallons, and is made of welded stainless steel. Compatible with our plastic and wooden cask bungs. Measures approximately 12" in diameter in the middle by 15" tall, with a 1 3/8" inner diameter keystone and a 1 15/16" inner diameter shive. For bulk purchase pricing, please call 651-289-4748 or email casks@northernbrewer.com