Firma Killich s.r.o. It offers slotted and pointed set screws according to DIN 553. In the assortment of slotted and pointed set screws DIN 553, the screws are steel, galvanized, nickel-plated, brass. Killich s.r.o. The company offers a range of locking rings according to DIN 705. The range of locking rings DIN 705 includes stainless steel A2, steel, white zinc.