CSD 3706 Stronghold Alloy Wheel Clamp Stronghold alloy wheel clamp fits 13" to 15" rims and 165mm to 205mm tyre sizes. Robust case hardened anti-saw steel construction. Easy fit onto security wheel bolt within 20 seconds. Sold Secure tested and approved at Caravan Gold standard and a high-visibility deterrent. Supplied with 10mm allen key, 3 keys and handy storage case.