Pololu - Aluminum Standoff: 1/2 Length, 4-40 Thread, M-F (4-Pack)

These hexagonal male-female aluminum standoffs keep parts spaced 0.5" (13 mm) apart and are great for building a multi-level robot chassis. Both ends of these 3/16"-wide standoffs have 4-40 threads. The standoffs are sold in packs of 4.
These hexagonal male-female aluminum standoffs keep parts spaced 0.5 (13 mm) apart and are great for building a multi-level robot chassis. Both ends of these 3/16-wide standoffs have 4-40 threads. The standoffs are sold in packs of 4.

Stand Off

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Aluminum Standoff: 1/2 Length, 4-40 Thread, M-F (4-Pack)

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Pololu - Aluminum Standoff: 1/2 Length, 4-40 Thread, M-F (4-Pack)