Product description: 

• This solid carbide cutter was sharpened on a diamond wheel and can be rotated to give you a fresh edge in a few seconds . Use it with the Round Carbide Turning Tool to smooth finishes on concave surfaces and hollowing jobs .Many wood turners purchase these for replacements on popular carbide woodturning tools or for their own woodturning tool designs. 
• More Features: -Ideal for giving you a smooth finish on curved, concave surfaces , hollowing jobs and for general turning applications -Cutter rotates give you numerous fresh edges without sharpening -Compared with steel the solid carbide stays sharp for longer Specifications: Designed for Easy Start Finishers/Full hollowers and other popular wood lathe tool.
• Diameter approximately .50" (12mm). Thickness .09" (2.5mm) with a .171" (4.40mm) dia. countersunk mounting hole at std. 82 degrees. Mounted with a mounting screw, 4-40 SAE thread size, 3/8" long flat head cap screw. More choices in our : Round :12mm dia -2.5mm thick-30*

Size: 12mm(0.472") Diameter, 2.5mm Thickness, 30 Cutting Angle, 0.178" dia. countersink mounting hole
Material ：Tungsten Carbide, Excellent for wood Howllowing,The right geometry or cutting angle is ground to provide an edge the cuts cleanly and safely
Very Perfect for finish the curved, concave surfaces , hollower jobs and for general wood turning applications
Leaves smooth finishing after cut
Package:10pcs diameter 12mm Round carbide insert in a plastic