These heavy duty Weld-On Creeper Joints are ideal for today’s flexible suspension systems. Super strong, Weld-On Creeper Joints will hold up to years of punishment. The inner flex ball is made from 8620 tool steel and rides on high quality polyurethane bushings. Heavy-duty, hardened steel washers hold the joint together. Creeper Joints are super flexible and allow for up to 40 degrees of movement when used with spacers.