17PCS accessories: 10 x corn milling cutter & 7 x ER11 Collet(1-7mm) It is ER11 precision spring collet. and wear-,Large holding force, wide clamping range. Gripping Range: 1mm to 7mm. Widely used in machining centers,general milling machines, CNC milling machine, engraving machine, high-speed machines, and other processing. Style: ER11 This set of carbide Milling Cutter is perfect replacements for your CNC machinery, make you enjoy a precise, easy cutting experience. Suitable for processing: PCB, Mould, plasti, carbon fiber, composite board, hard wood... and so on. Safety Instructions: 1. blades permanently enclosed in a or housing with less than 2mm of blade exposed. 2. The bladed product is not use for people under 18 years. 3. The item is only use for industrial cutting/engraving, not hazardous article. Material: 45 # steel+metal color: Random color+silver Note: Random color, don't accept the specified color. Size: A type: Shank diameter: 3.175mm diameter: 1mm Total length: 38mm B type: Size: Show as in the picture. 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. Package Contents: 10 x corn milling cutter 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.