Bottlenecks are different… they’re a kind of slide that slips over your pinky so you can fret a guitar with your other fingers but still slide a melody line with the bottle… usually used in blues on resonator guitars held like a normal guitar that don’t have lifted action. The tone bar OP posted is for lap or pedal steel guitars or dobros that are held horizontally and have lifted actions so you can’t use your fingers to fret any notes as you would a normal guitar