5 mm hex key (Allen key), short series, 83 mm long

hex-metric

Use it

(import "parts/hand-tool/HT-HEX-5-short.ik" as p)

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

Frame of reference

Engagement tip z=0; working long leg +z, other leg +x; outside long dimension = long, outside arm dimension = arm. Elbow centre z=long-s/2; short tip x=arm-s/2.