2 set Industrial tools: 1 set x Collet Chuck Adapter & 1 set x ER11 Collet(1-7mm) It is ER11 precision spring collet. and wear-,Large holding force, wide clamping range. Widely used in machining centers,general milling machines, CNC milling machine, engraving machine, Strong & : The high-quality materials show their high durability. Stable Performance: The product has a stable performance due to its precision and quality. Practical: It can help you make better, more efficient and more processing products.The chuck Can be converted into 6 handles, 6.35 handles and 8 handles. It's split bushing converters for multiple purposes of chuck or collet sutability. Processing by heat treatment and precise grinding, to use. Material: 45 # steel+metal Colour: black + silver ER11 Collet: high-speed machines, and other processing. Style: ER11 Gripping Range: 1mm,2mm,3mm,4mm,5mm,6mm,7mm Fits metric shank size(s): For example,1mm Collet Fits 1mm metric shank,2mm Collet Fits 2mm metric shank. Used for chuck conversion of trimming, engraving machines. Suitable for engraving machine, wood router.Collet Chuck Adapter only,perfect woodworking tool. Package Contents: 1 x 0.24 inch / 6 mm Collet Chuck Adapter (with 1pcs 6mm/6.35mm universalnut) 1 x 0.25 inch / 6.35 mm Collet Chuck Adapter 1 x 0.32 inch / 8 mm Collet Chuck Adapter (with nut) 1 x 0.24 inch / 6 mm angle grinder chuck conversion 1 x 0.25 inch / 6.35 mm angle grinder chuck conversion 1 x 0.32 inch / 8 mm angle grinder chuck conversion 7 x ER11 Collet(1-7mm) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.