For lightweight concrete, masonry bricks, Poroton, hollow blocks and soft sand-lime bricks (universal, color coding system: silver), radius slots in the lid for dust extraction, laser-welded segments, M16 thread for use in hammer drills with SDS-Plus / TE-C holder, Note: By selecting the right core bit for the existing material, the service life of the diamond segments can be significantly increased!, Please note: When drilling, socket cutters should always be used without a hammer blow!