The vehicle is the result of a combination of the 15 cm heavy infantry howitzer and the Pz. Kpfw. 38 (t) tank chassis. Its road performance will approximate that of the Pz. Kpfw. 38 (t) tank.
The howitzer, from which the trail has been removed, is mounted well forward on the chassis within a box-like, open top shield, the front plates of which overlap the original gun shield. The box shield has a thickness of 25 mm in front, 15 mm at the sides, and 15 mm at the rear. A further plate, fitted over the barrel and recuperator, is elevated and depressed with the howitzer, which also retains its original traversing and elevating mechanisms. Sighting is done through the aperture in the howitzer shield, by dial sight. Six metal sheets in the shape of a 3/4 circle are fitted to the sides of the fighting compartment, four vertically at the rear on the right, and two horizontally forward on the left. These may house a shell each, thus making a total of twelve rounds, corresponding to the 12 lockers for cartridge cases and charges. AW/T set is carried. This is mounted on the left wall of the fighting compartment. A folding type rod aerial is mounted on the left. The general appearance suggests that the equipment is overloaded. The silhouette is high.
The piece, a standard German infantry support weapon, has a length of 64.57 inches, a muzzle velocity of 790 f.s., and a maximum effective range of 5140 yards. Its field mounting traverse is reported as 11°, its elevation 0° to plus 73°. Its recoil mechanism, which consists of both buffer and recuperator, is housed in a casing underneath the barrel and extends almost the entire length of the latter. The gun fires an 83.6 lb. H.E. shell, and an 84.7 lb. smoke shell.
SPECIFICATIONS
| Weight | (approx.) 12 tons | |
| Length | 15 ft., 3 ins. | |
| Width | 7 ft. | |
| Height | ||
| Ground clearance | 15 ins. | |
| Tread centers | 5 ft., 9 1/2 ins. | |
| Ground contact | 8 ft., 6 3/4 ins. | |
| Width of track | 11 ins. | |
| Pitch of track | 4 1/2 ins. | |
| Track links | 89 | |
| Fording depth | 3 ft. | |
| Theoretical radius of action | ||
| Roads | 140 miles | |
| Cross-country | 100 miles | |
| Speed | ||
| Roads | 25 m.p.h. | |
| Cross-country | 15 m.p.h. | |
| Armor | ||
| Front plate | 25 + 25 mm | |
| Sides | 30 mm | |
| Armament | 15 cm. s.I.G. 33 | |
| Ammunition (rds.) | 12 | |
| Engine | Praga 6-cyl., 125 h.p., gasoline | |
| Transmission | 5 speeds forward, 1 reverse | |
| Steering | Epicyclic clutch brake | |
| Crew | 3 |
German: p. 20