An Assault Drill, also known as a Siege Drill, is a weapon used by Space Marine Siege Dreadnoughts and Centurions to breach fortifications during siege operations. The smaller version of the weapon is known as a Siege Drill when employed by Centurions. An Assault Drill bores through natural rock as easily as it does reinforced ferrocrete, which is the substance of which most Imperial fortifications and other human structures are composed.
Once the drill has penetrated the obstruction, a Heavy Flamer built into the device unleashes an inferno inside the bunker, killing everything within. The Assault Drill consists of three spherical drill heads which rotate rapidly to grind away any obstruction.
- Imperial Armour - Apocalypse (2007), pg. 29
- Codex: Space Marines (6th Edition), pp. 94, 172, 175