This is the Dive Rite Lockdown Screw Kit for Classic Reels Features: Stainless steel For classic reels Dive Rite introduced a permanent stainless steel lockdown screw for their Classic series reels. It solves a long standing problem found on nearly all guideline reels... that if the diver keeps turning the screw after the spool is unlocked, the screw will fall out of the reel frame and usually be lost. The benefit of the new permanent lockdown screw is once the spool is unlocked, the diver cannot keep turning the screw and it will not fall out.