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Firmly Welding Technology :This hollow drill bit adopts high frequency quenching ,so its teeth can be not easy to break depends on that it keeps silver welding technology to weld firmly Excellent Cutting Tools :Even force and smooth cutting keeps that three blades are stressed at the same time . Drill the depth of up to 50mm ,metal hollow bit can easily solve the thickness below 50mm Highly Hardness & :This twist hollow drill bit with highly hardness is not easy to damage ,this high?speed steel drill bit keeps high?quality and durability with wear resistance Scope of Application :This claw type cutting tool is suitable and widely used for gypsum board ,plastic ,aluminum board ,1mm density board computer desk ,iron sheet ,wood board within 25mm ,etc . Regulatory Compliance :This hollow bit is entitled with high performance according to strict rule .The drill bit is designed and manufactured according to international standard ,strictly follow factory quality control