Brand: COMP Cams Manufacturer's Part Number: 4901 Part Type: Dial Indicator Stands Product Line: COMP Cams Cam Checking Fixtures Summit Racing Part Number: CCA-4901 UPC: 036584720157 Magnetic: No Stand Material: Aluminum Stand Finish: Blue anodized Quantity: Sold individually. Notes: Dial indicator not included， this is the cam checking fixture only. Fits 1/2 in. and 7/16 in. threads. Designed to be used with cylinder heads off. COMP Cams Cam Checking Fixtures COMP Cams offers two styles of cam checking fixtures--heads on and heads off--to suit your automotive needs. The cylinder heads' off-engine fixtures were designed to maintain proper geometry， while holding a dial indicator (not included) and a 5 in. extension (included) precisely over the lifters. These professional quality tools are much easier to use and more precise than using a magnetic indicator base when degreeing a cam. These multi-functional tools can also be used to check rocker ratio， piston to valve clearance， and even crankshaft end play.