7pcs ER11 5mm Motor Shaft Extension Holder + ER11 1-7mm Spring Collets Kit Features: Made of specially developed spring steel, to use. Professional production, exquisite workmanship, high reliability. The self-timer's built-in design and tools will never get stuck in the handle. Using any standard ER collet coolant-thru attachment application tool. Widely used for boring, milling, drilling, silk attack, carving, CNC and other processes. Specification:Condition: Spring Bushing Model: ER11-1, ER11-2, ER11-3, ER11-4, ER11-5, ER11-6, ER11-7Packing List:1*Extension7*Spring Sleeve 1) We accept Alipay, West Union, TT. All major credit cards are accepted through secure payment processor ESCROW. 2) Payment must be made within 3 days of placing the order. 3) If you can't checkout immediately after auction close, please wait for a few minutes and retry Payments must be completed within 3 days. About shipping 1.