The geometric shape of standard Allen keys, featuring a cross-section with six flat sides., Hexagonal, A tube or pipe that is open inside, containing an empty cavity to transport fluids or protect cables., Hollow, The perfectly ball-like metal units inside a roller bearing assembly that reduce rotating friction., Spherical, The helical, grooved surface cut into a bolt or the inside of a nut to lock them together., Threaded, A long structural component that is completely full inside, heavy, and does not bend under weight., Solid, An even, polished metal surface with no friction or rough parts, like a new cylinder head., Smooth, A pneumatic rubber hose or wire harness that can bend easily around machinery without cracking., Flexible, A copper connection plate with four equal sides and perpendicular 90° corners, Square

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