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

These hexagonal male-female aluminum standoffs keep parts spaced 1.25" (32 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 1.25 (32 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.

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Pololu 2089 - Aluminum Standoff: 5/16 Length, 4-40 Thread, F-F (4

These 1/2-long hexagonal female-female aluminum standoffs keep parts spaced 0.5 inches (13 mm) apart. They are like elongated, 3/16″-wide hex nuts,

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

Pololu RP5/Rover 5 Expansion Plate RRC07B (Wide) Transparent Gray

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Pololu RP5/Rover 5 Expansion Plate RRC07A (Narrow) Solid Black