The heaviest casemates are often called of the Roman resistance, as their classes of resistance are numbered by Roman numbers from I to IV. The most typical Czechoslovak casemate was build in resistance class II. It means having roof two metres thick and armoured domes or cupolas with twenty centimetres wall. If possible, all these casemates were built of two floors (there are some sigle floor cases due to high groundwater level, mostly in sector Moravska Ostrava).
Objects of resistance class IV. were intended only for artillery groups (synonym of French Maginot line ouvrages). These big bunkers had walls of 3.5 metres reinforced concrete and their domes or cupolas had thirty centimetres walls, which meant that their weight reached up to 56 tons. In the times before WWII, Germans didn't have any gun able to destroy them (This was clearly demostrated during German tests early after take over of Czechoslovak border areas in autumn 1938.
Casemates of lower resistance, like the previous, these are often called of Arabic resistance according to numbering of their resistance classes by Arabic numbers from 1 to 2. They were usually built at places where tank attacks can hardly be expected, such as wooded areas. Constructors also often avoided use of anti-tank guns for them, so their main weaponry consisted of heavy and light machineguns or sometimes mortars. They typically don't have more than one armoured dome. Today you can recognise this type of casemates according to lack of stairway between floors, they simply have a ladder. And, of course, they are much smaller and their crew numbers were much smaller.