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Rock Drilling Tools Tapered Drilling Rod H22 7 Degree. High-Strength Alloy Steel: Manufactured with 55SiMnMo alloy steel for superior durability and wear resistance. Customizable Color: Color can be customized to Black or other specific requirements upon request. Optimized Hardness: Rod hardness HRC32-35, adapter hardness HRC49-57 for extended drilling life. Wide Application: Ideal for mining, quarrying, tunneling, and small aperture blasting construction. Flexible Customization: Supports full customization including shape, application, and machine type. Quality Assurance: Strict QC inspection and pre-check before delivery to ensure product reliability.