Pribor za bušenje stena - Produžna čelična oprema za udarno bušenje dubokih rupa - Oprema sa reverznim trapeznim navojem od 1 1/2 in do 2 1/2 in (38 mm do 64 mm)
Rock drilling — Extension drill-steel equipment for percussive long-hole drilling — Reverse-buttress-threaded equipments 1 1/2 to 2 1/2 in (38 to 64 mm)