Product Description: The spring is made of steel and is . The arbor extension eliminates the risk of the arbor being removed from the clamp. And extend the router drill to ensure full cutting depth. It makes you work better, safer, more efficiently, and less labor-intensive. Product Specification:Product Name: Cutter ExtensionProduct Material: Spring SteelSize: As shown in the pictureExtension Packing Size: 96mm*30MMFreling Packing Size: 25mm*25MM*38mmProduct Weight: er16-1/4 Chuck Extension (including 1/4 collet): 115g Er16-8mm Chuck Extension (including 8mm collet): 120g Product Packing Method: Plastic Box After Packing Size: 11x3x3. 5cm Package Contents:1 Cutter ExtensionHi, guys, thank you for visiting my store. If you want to buy more than we listed, please . If you need more of this item, you can use . We will give you the best price. Leave a message!