The Skra tower is cylindrical (diameter 10.6 m, height 8.2 m, wall thickness 2.4 m), two stories high, built of cobblestone, with dressed stone used for the door and windows. The structure lacks only the upper parts of the parapet walls. The entrance is on the north, at the second story. The first story is an auxiliary space; its walls hold four deep utility niches and two small windows angled upward.