Pololu - Aluminum Standoff: 1/4 Length, 2-56 Thread, M-F (4-Pack)

These hexagonal male-female aluminum standoffs keep parts spaced 0.25" (6 mm) apart and are great for building a multi-level robot chassis. Both ends of these 3/16"-wide standoffs have 2-56 threads. The standoffs are sold in packs of 4.
These hexagonal male-female aluminum standoffs keep parts spaced 0.25 (6 mm) apart and are great for building a multi-level robot chassis. Both ends of these 3/16-wide standoffs have 2-56 threads. The standoffs are sold in packs of 4.

Pololu 1948 - Aluminum Standoff: 1/2 Length, 4-40 Thread, M-F (4

Pololu - Zumo Chassis Kit (No Motors)

Pololu Mechanics Accessories - zeroDNA

2-56 Male-Female Threaded 0.5 in. Long Hex Aluminum Standoff

2-56 Male-Female Threaded 0.5 in. Long Hex Aluminum Standoff

Aluminum Standoff: 1 Length, 2-56 Thread, M-F (4-Pack) at MG

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Machine Hex Nut: #2-56 (25-pack) at MG Super Labs India

Aluminum Standoff: 1/4 Length, 2-56 Thread, M-F (4-Pack)

Aluminum Standoff: 3/16 Length, 2-56 Thread, F-F (4-Pack)

Pololu 2081 - Aluminum Standoff: 3/16 Length, 2-56 Thread, F-F (4-Pack)

Pololu Mechanics Accessories - zeroDNA