The flat rectangular profile allows it to sit in the hand without requiring the tension that a round spring hook does. The geometry on one side is for smaller instruments (including oboe & piccolo), the other side for saxes.
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JL Smith Spring Hook Tool - Flat Rectangular Profile
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JL Smith Spring Hook Tool - Flat Rectangular Profile
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Jl Smith Spring Hook Tool - Flat Rectangular Profile
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JL Smith Spring Hook Tool - Flat Rectangular Profile
LJ-8040-60%20LJ-Smith%2060%22%20Starter%20Step%2C%20with%207%201%2F4%22%20Radius.%20(Reversible)%20Each%20Step%20is%20Shipped%20with%20the%20Necessary
LJ-8040 LJ-Smith 60 Starter Step, with 7 1/4 Radius (Reversible)