|In stock...DIAMOND TWIST DRILL BIT to clean out bead holes. Superior Diamond Coated, Made in U.S.A.(not China), remove burs,cleaning or enlarge bead holes.These are long lasting quality twisted drill bits. Entire length 49mm long. Shank 5/64" or 2mm. Diamond surface on bit 15-20mm in length. Grit 120 . Will clean bead holes 2mm to 4mm. Lubricant is recommended for better performance and long lasting use.