ITEM NAME:8 Pcs Spring Collet Set Holder Engraving 5mm Extension Rod Motor Shaft ER11A Features: Made of high grade specially formulated alloy steel. Built in self-Release design and tools will never get stuck in holder. Use with any standard ER collet chucks for coolant-thru tool applications. Each collet is well packed in separate protective container. Widely used, boring, milling, drilling, silk attack, sculpture, and other processing. &;nbsp; Specifications: Type: Spring Collet Set Material: Alloy Steel Color: Silver Shaft Hole: About 5 mm Gripping range: 1- 7mm (1mm,2mm,3mm,4mm,5mm,6mm,7mm) &;nbsp; Package Included: 7 Pcs x Collet 1 Pc x Extension Rod &;nbsp; Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement. &;nbsp;.Use with any standard ER collet chucks for coolant-thru tool applications. Type: Spring Collet Set. 7 Pcs x Collet. 1 Pc x Extension Rod. Shaft Hole: About 5 mm. Built in self-Release design and tools will never get stuck in holder.