Cutter Steel for TYC-6B

Blade width 55 mm x total length 300 mm. 
Springs are attached. (The spring shape is different to other chipping hammers.)
 
TYC-6B requires its own cutter steel type (flat chisel).
 
There are two types of shank type. Please let us know which type you require. 
① Hexagonal shank φ 14.75 H x 60 L
② Round shank φ 17.45 × 60 L