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PRODUCT DESCRIPTION Material: steel with titanium plating on the surface Color: Silver Tool holder type: Hexagon tool holder Size: Ex1 - 10, Dr1 - 10 Universal chuck that suitable for most electric hand drills â‚ Remove broken screw in one step(Do not need to conversion the extractor or adjust the chuck) WARM TIPS : Must drill a hole first when the break screw surface is smooth. Otherwise the drill bit will slip Must be vertical and low speed when drilling, reverse use this bit, drill the first hole deeper will easier to take out It is best to use electric hand drill, can not be used the hammer drill mode! Must be low speed during use!