Countersink Set, Type Single Ended, Number of Pieces 4, Number of Flutes 0, Included Angle (Deg.) 82, Material Cobalt, Finish Uncoated, Application Countersinks And Deburs Aluminum, Non-Metallics And Plastics, Sizes Included 5/16, 3/8, 1/2, 5/8"Features - Material - Cobalt Finish - Uncoated Application - Countersinks And Deburs Aluminum, Non-Metallics And Plastics Sizes Included - 5/16, 3/8, 1/2, 5/8"WARNING: California Residents This product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm.California proposition 65 warning