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Hq3 Diamond Bit Impreganted Diamond Core Bits 16mm Triple Tube Wireline Core Drilling Bit. Customized Options: Customized products available with drawings or samples provided. Private Label Service: Logo printing and private labeling services are available. Short Delivery Time: Normal production takes 7 days with standard products in stock. Free Samples: Small value free samples provided at customer's delivery cost. Professional Team: Expert team with over 20 years of experience in drilling tools. World-Class Facilities: Equipped with precision CNC, milling, and sintering machines. Quality Assurance: Strict physical and chemical testing procedures in own lab. After-Sale Service: Free replacement for manufacturer-caused problems.