Features: Used for fixing drill bit, milling cutter, and others, keep the Dremel more steady. Turn on the grinder, keep it rotating into the locator, the grinder can punch accurately. Easily attaches to your rotary tool. Very safe when you are using the Dremel with it. Tough and very good quality. Great product and convenient. Compatible with Dremel rotary tool. Specification: Type Cutting Guide Attachment Kit Material plastic + high speed steel Inner diameter 19mm Outer diameter 26mm Tool converter diameter: 60mm; height: 42mm Drill diameter 3.175mm Function fix drill, dustproof Application for Dremel electric drill Package Includes: 7 piece set: 1x Cutting Guide 6x HSS Routing Router Bits 11 piece set: 1x Cutting Guide 4x Drill 6x HSS Routing Router Bits