5/pk Alpen FG #905.023 Fine Grit, Acorn shaped Multi Use Diamond Bur. Package of 5 Burs. Alpen Diamond Instruments are Swiss made providing enhanced quality. They undergo a unique, multi-layer bonding production process, which secures complete and uniform coverage, especially at the all-important tip. Alpen Diamond Instruments are manufactured under ISO standards. The multi-layer, natural diamond application process provides maximum uniform crystal coverage for enhanced cutting and longevity. Reusable.