3pcs 1/8 4mm 6mm ER11 Lathe Spring Collet Drill Bit Holder Vice Clamp CNC Tool. A set of spring collet in sizes 1/8, 4mm and 6mm for CNC milling lathe engraving machines. Collet must be placed into collet chuck nut before inserting into collet chuck. Inner Diameter: 3.175mm (1/8), 4mm, 6mm. Welcome and thank you for visiting!You may choose Standard, Registered or Express Post when completing checkout. Please let me know if you will be using bank transfer, so that I can look out for the funds. By communicating, well find an agreeable solution to any problem. The item "3pcs 1/8 4mm 6mm ER11 Lathe Spring Collet Drill Bit Holder Vice Clamp CNC Tool" is in sale since Thursday, July 16, 2020. This item is in the category "Industrial\CNC, Metalworking & Manufacturing\Metalworking Supplies\Tool Bits". The seller is "invbuys" and is located in Sydney. This item can be shipped worldwide.