Material: Other Scope of application: other Specifications: A: Convex 1 die 15 teeth (inner hole 5) B: Convex 1 die 15 teeth (inner hole 6) C: Convex 1 die 15 teeth (inner hole 8) A: Convex 1 die 16 teeth (inner hole 5) B: Convex 1 die 16 teeth (inner hole 6) C: Convex 1 die 16 teeth (inner hole 8) A: Convex 1 die 18 teeth (inner hole 5) B: Convex 1 die 18 teeth (inner hole 6) C: Convex 1 die 18 teeth (inner hole 8)