Usage Tips:[Main function] Used for engraving round utensils such as small bowls, trays, jewelry boxes, fly fishing boxes, storage boxes, pet feeding trays, etc. Round punching and pattern and template milling. The center- blade produces a perfectly smooth . [Good processing effect] The processed is smooth, not black, burr-free, and formed in one time. [Widely applicable materials] The double arc round bottom router drill bit is suitable for hardwood, cork, plywood, particleboard, fiberboard, plastic, acrylic, etc. [Applicable machines] Suitable for bakelite milling, hanging gong, ground gong, engraving machine, CNC, etc. and the small size can also be used for small trimming machines. Colour:As Shown Material:alloy Package Contents: 1 * 1/2x1/4inch Round Milling Cutter 1 * 1/2x1/2inch Round Milling Cutter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.