Redline RE-2PA 2 Post Lift 4" Motorcycle ATV Adapters Sold as a set of 4 3/8 inches thick steel frame Fits arms as wide as 4-1/8" Fits arms as narrow as 2-3/4" Redline recommends using customer supplied ratchet straps to secure your motorcycle/atv to your lifts' arms to ensure your safety while using this product