FAST & ECONOMICAL VALVE SEAT RESTORERATION SYSTEM. 25 MILLS + 8 GUIDE STEMS. Contents :- (25 pcs MILLS 30,45,70 DEG). (4pcs) Stems metric size 7mm, 8mm, 8.5mm, 9mm, 10mm. (4pcs)Stems inch size 11/32″, 3/8″, 5/16. We can also produce VALVE SEAT CUTTERS as per costumer requirement.