The Standard DL tremolo (or Standard double locking tremolo) is a double locking tremolo system developed and produced for Ibanez which was introduced in 2013. It replaced the Edge III, to which it is very similar, as the least expensive DL trem offered by Ibanez.
As with most other double locking tremolos, it is based on a design pioneered by Floyd Rose. It has two knife edges which rest against posts. The strings lock into the saddles, which can be adjusted for intonation. The tension of the strings is counter-balanced by a set of springs in the rear cavity which attach to a claw which allows the tension to be adjusted. Using this design, the bridge itself floats. Since the bridge mounted in a cavity which is routed out of the top of the guitar, the design allows the player to pull up or push down on the vibrato bar to adjust the pitch up or down — with a non-floating design the bar (and pitch) can only be pushed down.
The Standard DL tremolo is available in both 6-string and 7-string versions.