Specification Brand : Luo ke BulletPoint1 : Made of premium Vanadium Steel with high hardness, hard-wearing and anti-rust. BulletPoint2 : Burr size : 009, 010, 012, 013, 014, 015, 016, 017, 018, 020, 021,023 BulletPoint3 : Specific 3/32 inch ( 2.35 mm ) shank fits rotary tool, drill, grinder, hanging mills, etc BulletPoint4 : For carving of silver, jewelry, wood, walnut,olive core, beads, precious soft metal and more BulletPoint5 : Package contents: 12 pieces 3/32'' shank 45º Hart Burr jewelry burr set IncludedComponents : 12 pieces 3/32'' shank 45 degree bearing cutter hart burr ItemName : Luo ke 12 Pcs 45º Hart Burr - 3/32'' Shank 45 Degree Bearing Cutter Jewelry Setting Burr for Lapidary (009-023) ItemPackageDimensions_Height : 0.5 inches ItemPackageDimensions_Length : 4 inches ItemPackageDimensions_Width : 3 inches ItemTypeKeyword : cutting-burrs Manufacturer : Luo ke Material : Vanadium Steel NumberOfItems : 12 PartNumber : QC307-45 ProductDescription : Made of premium tungsten steel with high hardness, hard-wearing and anti-rust. Can be used in hanging mills, bench mills,electric grinders,rotary tool, etc. For carving and grinding of silver, jewelry, wood, walnut and more, recommended for olive core, beads, ivory, wood, bone, precious soft metal , etc.