Vintage Simmons Drums (UK) Users Group

We all know how easily (and at what prices). are selling today any product with the Simmons brand, but can anyone explain to me what the hell can serve this for?

http://www.ebay.com/itm/SIMMONS-bass-drum-leg-spur-/220979938863?pt=LH_DefaultDomain_0&hash=item33736e462f