Wax Burs 12pc Set Our 12pc Wax Bur Set is Swiss Made with 3/32" shanks and features coarse, no-clog flutes. These assorted Wax Burs are perfect for everything from basic design to fine detail work in wax models. Use with any high speed motorized rotary hand drill such as our item PO270. Overall shaft lengths are 1-3/4". For use on wax only.