Features Excellent Tungsten Steel Material: This stone carving set is made of excellent tungsten steel material with high hardness, heat and wear resistance, strong anti erosion effect and longer service life. Fine Groove Type: This grinding bit adopts fine groove type, with fluent chipping, no dust pollution, high concentricity, stable and reliable, applicable to more complex working conditions. Round Shank Design: This polishing rotary tool bit is designed with round shank, which is easier to clamp the tool correctly, and has a wide range of applications. Wide Application: This grinding burr bit set has a wide range of applications and can be used for mold processing and manufacturing, mechanical chamfering, chamfering and groove processing, cleaning burrs, burrs and weld seams of casting and forging weld Multifunctional: This burr bit is multifunctional and is suitable for sanding all kinds of metal, wood, copper and aluminum, plastic and other soft and hard materials. Specification: Item Type: Grinding Drill Bit Set Material: Tungsten Steel Applicable Machines: Electric Hand Drill ( Chuck 6mm or Above), Cordless Electric Hand Drill, Straight Head Electric Grinder, Benchtop Electric Drill Application Scope: Mold Processing and Manufacturing, Mechanical Chamfering, Chamfering and Groove Processing, Cleaning Burrs and Welding Seams of Casting and Forging Welding Pieces, Metal and Non Metal Materials Artistic Engraving Applicable Materials: All kinds of metal, wood, copper, aluminum, plastic and other soft and hard materials. Package List:8 x Grinding Bits1 x Storage Box  Note:Used on pneumatic or electric tools at 6,000 to 50,000 rpm. Package List 8 x Grinding Bits 1 x Storage Box