It has an internal thread at the bottom of the bar to screw into the tremolo. Internal thread to screw into the tremolo.
Gotoh SGL-510-L5G Tuners 3+3 Gold - For Guitar/Luthier
GOTOH® 505 serie and Wilkinson VS100N Vibrato arm chrome
Strat Style Neck with Gotoh Machine Heads and Tuners - Spares Or Repair
2pcs, Elegant Stainless Polished 510 Drip Tip and Sparkly Resin 510 Drip Tip 510 Mouthpiece 2pcs (Rainbow)
8 alto saxophone Mouthpieces ( rico A7 A7 C5 king 2 and 4 unbranded)
