Why does the South African 10c coin have ridges?

The South African 10-cent coin features ridges, known as "reeding," primarily for two reasons: to deter counterfeiting and to enhance grip during handling. The ridges make it more difficult to produce counterfeit coins, as replicating the exact texture is challenging. Additionally, they provide tactile feedback, making it easier for people to recognize the coin by touch, especially for those with visual impairments.