The M-66 is a 160 mm mortar manufactured by Soltam of Israel. The weapon was based on an earlier 160 mm design, the M-58 mortar by Vammas of Finland. It can fire a 38 kg (84 lb) HE bomb out to a maximum range of 9,600 m and requires a crew of 6-8 to operate. In addition to the towed variant, the M-66 was mounted on Sherman tank chassis, resulting in the Makmat 160 mm.