ProSolve Wheeled Linemarker Aerosol Applicators are available in 2 wheeled variants that can be converted to 4 wheels with the additional rear mounted frame suitable for 750ml aerosol cans with a quick release adjustable rod to enable use with 600ml can sizes as well. The applicator offers an easy use thumb push trigger for ease of application/usage.Features and Benefits Two wheels with the option to convert to 4 with additional rear mounted frame Quick release adjustable rod Suitable for 600 and 750ml aerosol cans Easy use thumb push trigger for ease of application/usage Quick fit bolt on adapter to convert to 4 wheels (4 wheeled version)Typical Applications Line markingNotes 4 wheeled variant is a combination of the 2 wheeled version and the additional bolt on frame. To purchase the 4 wheeled version both of these products must be selected.