Around 500 of the assemblies, called the "Culin Rhino device" or "Culin hedgerow cutter" by the Americans, were manufactured. These devices were used to modify nearly three-quarters of the US 2nd Armored Division's M4 Sherman and Stuart tanks and M10 tank destroyers in preparation for Operation Cobra. The British Royal Electrical and Mechanical Engineers (REME) referred to the devices as "Prongs" and produced 24 from ex-German beach defenses, but thereafter Prongs were produced in the United Kingdom. Six hundred Mark I Prongs were delivered by August, to be fitted to the Sherman V. A further 1,000 Mark II Prongs were produced, to be fitted on Shermans and the M10, and 500 Mark III prongs were manufactured for the Cromwell tank. The Churchill tanks were not considered to need the Prong, but some were equipped with them nonetheless.