A.T.L.A.S.-mounted for total shell isolation, the Ludwig Anchor Spurs creates a solid, slip-free playing foundation on any bass drum. Elegant and classic in design, yet built for slip-free positioning and uninhibited shell resonance, the A.T.L.A.S. Anchor increases the performance of vintage and modern drums without sacrificing fit or finish. The drill-free shell mounting of the included A.T.L.A.S. suspension system allows you to upgrade your lugs, minimize shell contact and preserve your finish. The spurs extend to twice their actual length to accommodate bass drums from 16" to 26". Also, these spurs are easily detached from the anchor to easy packing.