The Grenade, Hand, Anti-Tank No. 74, commonly known as the S.T. Grenade or sticky bomb, was a British hand grenade designed and produced during the Second World War. The grenade was one of a number of anti-tank weapons developed for use by the British Army and Home Guard as an ad hoc solution to a lack of sufficient anti-tank guns in the aftermath of the Dunkirk evacuation. Designed by a team from MIR(c) including Major Millis Jefferis and Stuart Macrae, the grenade consisted of a glass sphere containing nitroglycerin covered in a powerful adhesive, and surrounded by a sheet-metal casing. When the user pulled a pin on the handle of the grenade, the casing would fall away and expose the sphere; another pin would activate the firing mechanism, and the user would then attempt to attach the grenade to an enemy tank or other vehicle with sufficient force to break the sphere. After it was attached, releasing the lever on the handle would activate a five-second fuse, which would then detonate the nitroglycerin.