Robots are held together with fasteners. Most typical are button head screws, which use hex wrenches to screw and unscrew the fasteners.
Hex Wrench Set - Temu
Hex Wrench 5/64 - RobotShop
5/64 Hex Key Size, English Allen Wrench
5/64 Hex tools (0.078 inch) - Max-Gain Systems
YHXiXi 5IN1 Ring Allen Wrench Set - 5/64 1/8 5/32 7/32 Allen Key Door Keys with 1 Keychain for Push Bar Panic Exit Device
26Pcs Allen Wrenches Hex Key Set with Ball End Metric Inch Standard Sizes Folding Hex Allen Keys Allen Key Set L-Wrench Hex Tool - AliExpress
5/64 Allen wrench
Hex Allen Wrenches for RC Cars, Boats, Planes & Helicopters
Powerbuilt 9 Piece Zeon Metric Hex Key Wrench Set for Damaged
5/32 inch Allen Wrench — Wolff Industries, Inc.
8 Pack Hex Head Allen Wrench Drill Bit Set 1/4 inch Hex Magnetic
Everything You Need To Know About Hex Key Sets
Klein Tools 8-Key Folding Hex Key Set 70581 - The Home Depot
Hex Wrench Set - Temu
Wiha 66947 Ball End Hex Inch L-Key 5/64