Waldhausen Leather Lunging Surcingle is versatile training tack for use when lunging your horse. Horse training surcingle features softly padded leather and 12 stainless steel rings for lots of options. Black. Horse/Full size: the length from top billet hole to top billet hole, along the inside (the portion that would lay across the horse's back) is about 60". The girth it comes with is about 15", buckle to buckle.