General description maXpeedingrods' B1 series coilovers are designed for Vauxhall Astra H Mk5 Van models from 2004 to 2010, providing an excellent solution for those looking to replace worn-out struts while enhancing handling performance. These adjustable suspension shock springs allow for customization of ride height while maintaining OE ride quality. Technical specifications Application: Vauxhall Astra H MK5 2004-2010 (1.2, 1.3CDTi, 1.4, 1.6, 1.6 Turbo, 1.7CDTi, 1.8, 1.9CDTi, 2.0 VXR, 2.0 Turbo), Opel Astra H Mk5 Hatchback / Estate 2004-2010, Opel Zafira B 2005-2014 Adjustable Height: Front Lowering 30-75mm (depends on vehicle models) Adjustable Height: Rear Lowering 25-65mm (depends on vehicle models) Spring rate: Front 3.5kg/mm, Rear 3kg/mm Front spring inner diameter: 64-83 mm Rear spring inner diameter: 49-60.5 mm Spring length Front: 239 mm Spring length Rear: 210 mm Spring Preload advised: 7-10 mm Shock type: Twin tube Warranty: 2 years for any manufacturing defect