AJ Tack Wholesale Aluminum 3" StirrupsSet of extra wide aluminum flat bottom stirrups with leather tread. Made with heavy thick duty aluminum, hand laced leather tread. Polished trim, no engraving. This is the widest stirrups we carry, the widest part of foot tread measures 6 1⁄2", perfect for people with wide boots. Neck: 3" (measure from inside) ..