Slot

Key O. Two centres and a width give an elongated hole with round ends.

A slot: two semicircles and two tangent lines tied by equal radii.
A slot: two semicircles and two tangent lines tied by equal radii.

Click the first centre, the second centre, then the width with a third click. The exact sizes are set with dimensions: the distance between the centres and the radius of an end.

What you get

Two parallel lines and two arcs held by tangencies and equal radii. Such a slot stays a slot through any change: drag a centre and the arcs follow without coming apart.

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