Based on this product's specifications, here are some alternatives and similar models
T-handle hex key 4 mm, No name 48604
Summary description:
T-handle hex key (allen key) with 4 mm hex tip, model 48604 by No name. Designed for applying higher torque than standard L-keys, it has a T-shaped handle for comfortable two-handed use and improved grip. Suitable for assembly, maintenance and repair tasks that require a 4 mm internal hex drive on fasteners and components.