Features1This is a set of split bushing converters for multiple purposes of chuck or collet sutability 2Adopted springsteels material, it is of good flexibility and wear resistance 3High precision, tight and stable clamping offer much convenience of workings 4Comes with 9 pieces of various sizes of adapters, so they are applicable to different specifications of the bit tool and chuck 5Suitable for engraving machine, wood router. A woodworking toolSpecificationFeatures: This is a set of split bushing converters for multiple purposes of chuck or collet sutability. Adopted springsteels material, it is of good flexibility and wear resistance. High precision, tight and stable clamping offer much convenience of workings. Comes with 9 pieces of various sizes of adapters, so they are applicable to different specifications of the bit tool and chuck. Suitable for engraving machine, wood router. A woodworking tool. Specifications: Material: Springsteels Outer Diam. - Inner Diam.: 12.7-6.35mm, 12.7-6mm, 12-6mm, 12-8mm, 12-10mm, 10-8mm, 9.5-6.35mm, 8-6mm, 8-6.35mm Weight: Approx. 90g Package Included: 9 * Chuck Collet Adapters Package List