Hays heavy-duty flexplates for high performance and competition engines are constructed of a thicker than stock steel plate, enabling them to withstand the stress of high-stall torque converters and high-RPM engines. While factory stock plates tend to crack around the crankshaft hub when punished under high torque and RPM conditions, the thicker Hays flexplate handles the force. These H.D. flexplates are supplied with a ring gear that is securely welded in place and feature dual bolt patterns for flexibility in adapting to multiple transmission style torque converters. All Hays heavy-duty flexplates are zinc-dichromate plated to resist corrosion and are SFI certified under specification 29.1. Thicker Than Stock Steel Plate Ring Gear Securely Welded Dual Bolt Patterns Zinc-Dichromate Plated To Resist Corrosion Withstands High Torque and RPM Additional Attributes: GTIN: 00084041100127 Center Bore Diameter: 2.490 in. Engine Balance: Internal Finish: Steel Material: Steel SFI Certification: 29.1 Tooth Quantity: 153 WARNING CA Proposition 65: No Extened Information: Emissions : Legal US Life Cycle Status: Available To Order Packaging: Quantity of Each: Package UOM: Dimension: 15.5000 x 15.7000 x 1.5000 inches