Pololu - Hex (Allen) Wrench 0.05

This 0.05" diameter, 1.75" long by 0.6" wide flat-ended hex key works with small hex screws, such as the #4-40 set screws included with some of our mounting hubs.
This 0.05 diameter, 1.75 long by 0.6 wide flat-ended hex key works with small hex screws, such as the #4-40 set screws included with some of our mounting hubs.

Pololu Universal Aluminum Mounting Hub for 5mm Shaft, #4-40 Holes (2-P – MakerSupplies Singapore

Jetech Inch allen wrench set ball-end 10-piece 1/16 5/64 3/32 1/2 1/8 5/32 3/16 1/4 5/16 3/8 extra long arm hex key spanner kits - AliExpress

Pololu Universal Aluminum Mounting Hub for 5mm Shaft Pair #4-40 Holes

Pololu Universal Aluminum Mounting Hub for 3mm Shaft, #4-40 Holes (2-Pack), POLOLU-1078

1PC T-Handle Allen Wrench Ball End Hex Key Set Long 5/64-3/8 1.5-10m` F4W7

1081-Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-Pack)

Vessel 2.5mm Hex Key Allen Ball Point Stubby L-Wrench – Tool Guy Republic

Pololu - 12mm Hex Wheel Adapter for 6mm Shaft (2-Pack)

Pololu Universal Aluminum Mounting Hub for 4mm Shaft, #4-40 Holes (2-P

Welloo Ball Point Hex - 9Pcs Allen key set, Setin Finished CR-V for ve – McareSpareParts

Universal Mounting Hub - 5mm Aluminum - ROB-10006 - SparkFun Electronics

Pololu Universal Aluminum Mounting Hub for 8mm Shaft, M3 Holes (2-Pack)

ULTRA LIGHTWEIGHT ALLEN WRENCH 3.0 – Savox USA