Carbide Tipped Valve Seat Cutter Set 25 Pcs For Vintage & Modern. CARBIDE TIPPED VALVE SEAT CUTTERS SET. BIG BLOCK DIESEL AND PETROL ENGINES. CUTTERS CAN BE USE FROM BOTH SIDES FACE AND DEGREE. Contents :- (25 pcs cutters). (4pcs) Stems metric size 7mm, 8mm, 8.5mm, 9mm. (4pcs)Stems inch size. 11/32″, 3/8″, 5/16″, 7/16″.