In the Platinum Set we substituted our famous "Stainless Slenders" in place of the DCAP-3 and Lifter pick. The Slenders are useful in working with PARACENTRIC type key ways. I have never seen a truly paracentric key way, but manufacturers do make the warding close to being interlaced as a way to keep standard width picks out. If they made a truly para centric keyway, the key would be very fragile. However our Slenders are only about 0.015 inches thick, so they easily pass through these key ways. And because they are made from Government Steel, they do so from a position of strength, as well as fineness. A French locksmith had asked us to make a low profile hook pick in the slender design. We made one because of his request and added it as well!