It is a single locking tremolo, meaning that the strings are locked only on one end, rather than both ends in a double locking design. The SLT101 uses a locking nut, but the strings aren't locked at the bridge side. Instead, the strings are inserted into a hole in the back of the (faux) string lock screws and are anchored there. The SLT101 is used on a few of the more affordable guitar models, including the S270 and RG270. The Ibanez part number of the SLT101 is 2SL1C12C. Portal: Tremolo bridges | Parts File:Parts-icon.png