1 X Carbide Tip Insert Cutter 12mm Round AU Cup Cutter for Woodturning UK

12mm Round 4.0mm Thick AU Aluminium M4 Countersunk Hole. 12mm Round 2.5mm Thick 30 Degree M4 Countersunk Hole (fits Rutland Mini Set). 12mm Negative Rake Round 2.5mm Thick 30 Degree M4 Countersunk Hole.

eBay