An apparatus for cutting off concrete, wooden, and/or metal piles, casing, conductor pipe and other metal tubulars, uses a metal frame and a metal blade linearly moveable within the frame, the blade being hydraulically and/or pneumatically driven to puncture and then slice and split through the metal being cut off, the cutting surface of the blade having a removable, centralized puncture point located essentially at the projected intersection between two concave cutting surfaces.