Bolt for the harmonic balancer (to crankshaft) for several General Motors Vortec engine applicatios 1998-2017. For example:

Escalade 5.3L, 6.0L, 6.2L V8 2002-2013,
Camaro/Firebird 5.7L, 6.2L (incl. Supercharged) 1998-2013,
Corvette 5.7L, 6.2L (incl. Supercharged)2001-2013,
Colorado/Canyon 5.3L 2009-2012,
Express/Savana Van 1500 5.3L 2003-2013,
Express/Savana 2500/3500 4.8L, 5.3L, 6.0L 2003-2017,
SSR 5.3L, 6.0L 2003-2006,
Silverado/Sierra 1500 4.8L, 5.3L, 6.0L, 6.2L 1999-2013,
Suburban/Yukon XL 5.3L, 6.0L 2000-2013,
Tahoe/Yukon 4.8L, 5.3L, 6.0L, 6.2L 2000-2013,
Trailblazer 4.2L, 5.3L, 6.0L 2004-2009,
Hummer H2 6.0L, 6.2L 2003-2009,
Hummer H3/H3T 5.3L 2008-2010,
Pontiac G8 6.0L, 6.2L 2008-2009,
GTO/Grand Prix 5.3L, 5.7L, 6.0L 2004-2008 &
Saab 9-7x 5.3L, 6.0L 2005-2009