From Locked Up RC:
Our 2.5mm Hex Socket Driver made for Locked Up RC Miniature Scale Hex Bolts, Acorns and more.
These MEDIUM DUTY tools have been specifically designed to install our 2.5mm Scale Hex Bolts and 4-40 FLANGE acorns.
The shafts are 5mm in diameter and work great in LURC 5mm Bore Tool Handles, variable speed electric drivers and will also slide right in to most other brand RC driver handles.
Outer Diameter at Socket: 4.5mm
Shaft Diameter: 5mm
Material: Hardened Steel
Each order includes 1 tool tip.