The mine consists of an outer glass casing, the upper portion of which is 1/4-inch thick and the lower portion 2/5-inch thick. The external diameter at the base is 4 1/2 inches and at the top, 6 inches at the widest part.
A grooved shoulder on the inside of the case, about 2 inches from the bottom, supports the igniter plate. The mine may employ either a Buck chemical igniter or a new mechanized igniter, the Schuko. When the latter is used, the igniter plate consists of a thin sheet metal plate, which has a central hole for the igniter. When the Buck igniter is used, however, an igniter plate having the same diameter and igniter hole but of stronger design is employed. Around the top of the case is a grooved ledge which supports a thin glass shear plate approximately 1/32-inch thick.
A moulded glass pressure plate of 3/4-inch extreme thickness and 4 1/2 inches in diameter rests on the shear plate. There are two parallel grooves on the underside of the pressure plate which are designed to accept a metal safety fork that will bridge the outer edge of the mine and support the pressure plate until such time as the mine is laid. The two prongs are then withdrawn through the two grooves arming the mine. This fork is not supplied with the mine but is improvised by units.
Four raised strips moulded in the bottom of the mine are spaced so as to take a standard 200 gm. charge (Sprengkorper 28). When sufficient pressure (40 lbs.) is applied to the glass pressure plate, the shear plate is broken and crushes the top of the Buck igniter or trips the actuating lever of the Schuko igniter, depending on which is employed.
SPECIFICATIONS
| Weight of standard charge | 200 gm | |
| External diameter at top | 6 ins. | |
| External diameter at base | 4.5 ins. | |
| Height to lip of container | 4.2 ins. | |
| Thickness of casing (upper) | .25 in. | |
| Thickness of casing (lower) | .4 in. |
German: p. 304.6 (March 1, 1945)