The official Rimac Tools indicator bracket is specifically machined from anodized aluminum for the Rimac 1,000 lbs., and 500 lbs. Model Valve Spring Testers. The bracket mounts to the Rimac’s shaft, allowing for the use of an up to 3/8-in. base dial indicator (not included). As expected with Rimac, the level of precision is everything, you can measure spring heights to a resolution of .001 in. The kit includes a 1.5-in. standard and a 2 in. indicator extension tip.