Bolt Type Crimper ToolC. Sherman Johnson Hand Crimp Fittings have proven themselves over the years, however the overall integrity of the system depends on the proper tools for the job. The tools are designed with special width and relief patterns which apply to Johnson hand crimp fittings and instructions only. The use of other tools or crimping fittings other than Johnson hand crimp fittings with Johnson tools can result in failure of the terminal, personal injury or loss of life. This specific tool works well for the boat owner replacing several or all life line fittings on their boat. "Nicropress" tools were designed to crimp soft copper and aluminum oval and stop sleeves only.