Based on this product's specifications, here are some alternatives and similar models
Straight router/spiral cutter bit Wolfcraft 1 mm — 3802000
Summary description:
Wolfcraft straight cutting bit with 1 mm diameter, model 3802000. Designed for precise straight cuts and grooves in wood, laminates and similar materials when used with compatible routers or rotary tools. Single-diameter straight bit useful for joinery, trimming edges, slotting and detail work where narrow, accurate cuts are required.