Based on this product's specifications, here are some alternatives and similar models
Hammer Proline 12656 — sledge hammer, weight 6 kg, single piece
Summary description:
Proline 12656 is a sledge hammer designed for heavy-duty striking tasks. The tool has a mass of 6 kg and is supplied as a single piece per pack. Suitable for driving stakes, demolition, masonry and construction work where high impact force is required. Durable head and long handle offer leverage and control for manual striking applications.