United Abrasives- SAIT 45000 Tungsten Carbide Die Grinder Bur SA1 Double Cut/Alternate Cut 1/4 x 5/8 x 1/4 Tungsten Carbide construcion for long life and durability High Quality Manufacturing method delivers vibratin free operation Precision ground with diamond wheels to produce a very sharp uniform cutting edge Each enclosed in individual plastic capsules for storage and protection Excellent for confined or hard to reach areas