The PROLUBE Flexible Heavy Duty 18" Grease Gun Hoses are designed to allow greasing access to fittings with limited reach. Manufactured with polyurethane sheathing internally and polyester externally, these hoses have an inner diameter of 0.16” (4.1 mm), ideal for use in cold weather, and an outer diameter of 0.425” (11 mm) and are highly flexible. The ends of the hose are zinc plated steel with hydraulic crimping and rolled threads for extra strength. These hoses are suitable for use with hand and air-operated grease guns.