Trend Craft Pro Snappy 4-piece countersink and plug cutter set. This set incorporates two drill countersinks and matching plug cutters.
Plugs cutters are made from Tool Steel and are very slightly tapered.
Use on timber to drill a countersunk hole for a screw which is then plugged uses a plug/pellet made using the plug cutter.
Recommended that plug cutters are used in a pillar drill.