Bone tips are Aluminum caps that go on the raw ends of spiral metal corset bones or even white spring steel boning. When you need to cut bones down in length, or when you purchase a full coil of Spiral boning, this is the product you need to finish the job off. Spiral Bone Tips - 1/4" (6mm). #91-8015-06. Sold by the gross (144 pieces). Also sold by the Dozen.