It was standard mortar used by the British. Although called the '3-inch mortar' by the British Army, it's caliber was actually 3.2 in (81 mm). The launch tube was about 1.1 metres long and the entire system weighed about 5.72 kilograms. The average rate of fire was about twelve rounds per minute and the muzzle velocity of each round was about 198.1 metres per second.