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USED FOR-- Suitable for ER type tool handle, tool bar, extension bar nut holding drill bit, boring cutter and other tools. GOOD PERFORMANCE-- ER11 Type Collet Clamping Nut features strong clamping force, not easy to deform. WIDE APPLICATION-- Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry. HIGH QUALITY-- Clamping Nut Bit is made of high quality 42 crMo material for long lifespan, and solid. FOUR OPTIONAL TYPES-- There are four optional types, meet your different requirements. Color: Black, Silver White Sandblasting (optional)