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7 11 12 Degree Tapered Horse Drilling Bits for Rock Drilling Tunnelling. Customizable Colors: Available in Golden, Blue, Red, and other custom colors. Wide Diameter Range: Diameters from 28mm to 50mm to suit various drilling needs. High-Grade Material: Constructed from 35CrMoNiV alloy steel for durability. Advanced Manufacturing: Produced using CNC machinery, forging, and heat treatment. ISO9001 Certified: Manufacturing process certified under ISO9001:2015 and SGS standards. Long-Term Experience: Over 48 years of specialized manufacturing in drilling tools. Fast Delivery: Delivery time ranges from 3 to 15 days depending on season.