Drill Steels Drill steel is a specialised steel tool used in mining, quarrying, tunnelling, construction, and rock excavation. WALT-AIR Tool & Plant Limited offers drill steel rods – available in rope thread or 7-degree taper. 7-degree taper rods are available in lengths ranging from 400mm to 4000mm. R25 rope thread rods are available in lengths ranging from 610 mm to 2400 mm. We offer R25 connectors, R25 extension rods, 7-degree taper drill rods (fully carburised), and R25 fully carburised drill rods. https://www.walt-air.co.uk/product/22-x-108mm-shank-drill-rods/