Valve Seat Cutter Set with Adjustable Carbide Knives (DIN-HG30, ISO-K30). This professional valve seat cutter set is designed for precise repair of car engine valve seats with diameters ranging from 18 mm to 38 mm. The set features carbide (DIN-HG30, ISO-K30) adjustable knives that allow easy regulation of the countersink, making it compatible with virtually all vehicle types. Valve size range: 18 mm – 38 mm. Head diameter: 32 mm. Working angles (head degree): 15°, 30°, 45°, 60°. Expandable cones pilots for valve: 6 mm, 7 mm, 8 mm, 8.6 mm, 9 mm. Pilot adjustment range: ±0.3 mm e. Ø6 mm adjustable between 5.9-6.2 mm. Drive tool: Socket wrench. Durable carbide knives for long-lasting precision. Adjustable cutters for universal car engine applications. Expandable pilots ensure a secure and accurate fit during repair. Ideal for workshops and professionals involved in engine rebuilding and valve seat restoration.