SGP - a checkpoint screwed on and fitted with bolts, screws and the like into any base (concrete, wood, metal sheet), The resistant point in a solid casing, produced in several colours. You can ream the clamping screws after assembling in order to make disassembly impossible.

SGT - a "labelling" checkpoint to be carried with e.g. personal keys or for permanent fitting into identified things (for example giving out the keys, supervised appliances). Often used as a personal checkpoint or on the round. Not large casing dimensions.

SGM - a checkpoint to be embedded, fitted with cement mortar into the wall or conrete. Contact surfaces of checkpoints should form one surface with the surface into which they are fitted in. After the mortar has been tied/bounded, it is practically indestructible. The highest mechanical resistance.