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Multifunctional Masonry Metal Extension Drill Bit 4mm 135 Drill Bit Angle. Extended Lifespan: Up to 12 times longer life than ordinary high-speed steel drill bits. Anti-Walk Design: TG bits do not walk or hover, ensuring accurate centering. Versatile Material Compatibility: Suitable for metal, wood, plastic, stainless steel, cast iron, copper, and aluminum. Customizable Color: Any color customer likes is available upon request. High Speed Steel Material: Made from high-quality HSS for durability and performance. Firm Shank Holding: Straight shank allows for firm holding in standard and round chucks. Fast Delivery: Offers fast delivery service for all orders. Tailored Solutions: Customized solutions provided to meet specific project needs.