Greasable Shackles allow easy lubrication of polyurethane bushes. Serviceable design built from thicker steel, and incorporating protected grease ports. A cost effect insurance for the life of your leaf springs. Ironman 4x4 Suspension was the first company in the world to recognise the importance of greasable shackles and pin kits. The reason for the introduction of greasable kits was that polyurethane bushes will provide extra long life if they are greased. Ironman 4x4 shackle and pin kits are perfectly matched to be fitted with Ironman 4x4 polyurethane bushes and come complete with protected grease nipples, recessed nuts and washers. To enhance appearance and make them rust resistant, Ironman 4x4 greasable shackle and pin kits have been zinc rich coated.