Brand: ATI Performance Products Manufacturer's Part Number: ATI9189931 Part Type: Crank Pin Drill Fixture Kit Product Line: ATI Crankshaft Pin Drill Fixture Kits Automotive Fittings Part Number: ATI-918993-1 UPC: 800157024092 Drill Pin Fixture Included: Yes Drill Pin Fixture Inside Diameter (in.): 1.484 in. Drill Pin Fixture Material: Steel Drill Pin Fixture Color: Black oxide Drill Pin Fixture Drill Bit Included: Yes Drill Pin Fixture Drill Bit Size: 11/64 in. Quantity: Sold as a kit. Notes: Fits LS1 engines only. For locating timing marks to use a distributor instead of the electronic timing. Description: ATI Performance Products crankshaft pin drill fixture kits are designed to pin the crankshaft for high-rpm, supercharged, turbocharged, or high-horsepower nitrous oxide engines. They include a billet aluminum black-anodized drill fixture, a hardened 11/64 in. drill bit, an alignment tool, and pins for the crankshaft.