Brand: Sealed Power Manufacturer's Part Number: SPGR1 Part Type: Plastigage Product Line: Sealed Power Plastigage Summit Racing Part Number: SLP-SPGR-1 UPC: 614046869868 Minimum Clearance (in.): 0.001 in. Maximum Clearance (in.): 0.006 in. Quantity: Sold as a pair. Notes: Kit includes one green strip clearance 0.001 in. - 0.003 in.， and one red strip clearance 0.002 in. - 0.006 in. Sealed Power Plastigage Made from a special extruded plastic thread with accurately controlled crush properties， Sealed Power Plastigage provides a fast and accurate way to check bearing clearances. It is packaged in a calibrated envelope that not only protects the plastic threads， but also serves as a scale to measure the bearing clearance. One package contains enough Plastigage to check both main and connecting rod clearance for one engine.