The Brake Lathe Cone is engineered to provide accurate centering and secure mounting during brake rotor and drum resurfacing. Specifications: Product Type: Brake Lathe Cone Centering Range: 5.50" – 6.50" Bore Size: 1-7/8" Application: Brake Rotor and Drum Machining Construction: Precision-Machined Heavy-Duty Material Country of Manufacture: Made in the USA.