The EZ drum mandrel makes sanding band changes easy; just pull, place and secure. The one-piece mandrel design simplifies the process of changing bands and makes it easy to sand flat surfaces and edges. Provides a quicker and easier alternative to using a traditional sanding mandrel. Allows for flat sanding and edge sanding. Compatible with all Dremel rotary tools. Compatible with all Dremel 1/2" sanding bands. Bit diameter 12.7 mm.