Based on this product's specifications, here are some alternatives and similar models
Allen hex key (imbus) 8 mm, JCB JCB-76408
Summary description:
Hand tool: 8 mm hex (imbus/Allen) key by JCB, model JCB-76408. Designed for tightening and loosening hex-head fasteners with an 8 mm internal hex size. Suitable for mechanical, construction, maintenance and assembly tasks where access to recessed hex sockets is required. Single-size tool for precise torque application on compatible bolts and screws.