Color: Black w/ Double Red Rings Inner Diameter: 0.355 Outer Diameter: 0.550 length of ferrule: 1” Quantity: 1 dozen These premium ferrules are produced in small batches with very tight tolerances. They require little to no ferrule turning upon installing. They fit .355 taper tip shafts perfectly, but can also fit onto a .370 parallel tip shaft by reaming out the inner diameter.