1/4 in drive 4 mm socket, 6-point, standard, 24.7 mm long

socket

Use it

(import "parts/hand-tool/HT-SOCKET-1-4-4-6P.ik" as p)

In a design on ink: ask your agent for it by name, or by what it must be.

Frame of reference

Fastener mouth z=0; square-drive mouth z=length; axis +z; hex flat normal +x.