It's split bushing converters for multiple purposes of chuck or collet sutability. Made of carbide, high strength and hardness.Processing by heat treatment and precise grinding, to use. Suitable for engraving machine, wood router.A perfect woodworking tool. Used for chuck conversion of trimming, engraving machines. Collet Chuck Adapter only, other accessories demo in the picture is not included., Weight: 0.01763698096 pounds, Manufacturer: Hipzeepo