Sometimes you need a little more "Purchase" to get that blade open. The MONSTER thumbdisk is the answer. 25% larger then the stock model, but without protruding past the scales. Drop in fit. This is THE answer to those hard to open knives! Available in "Rifle" and "Double Rifle" knurling, in any of our standard Ti finishes. *Does NOT fit the Hinderer FireTac or ZT-0620/30/40 knives!*