Here we have an OTC 7639. Here's the complete set for servicing seized disc-brake rear-caliper slides on GM W-body cars.
OTC 6686 GM Northstar V8 Cam Tool Kit
OTC 7832 GM Torsion Bar Unloader
OTC 6777 GM Duramax Injector Puller
OTC Tools USA Made GM W-Body Brake Bushing Service Air Hammer Bit Tool - No 7639
CTA Tools 7639 Ford Valve Spring Compressor - 4.6L, 5.4L & 6.8L 3V
SK 7600 Convertible Retaining Ring Pliers 6 PC Set 7641 7640 7633 7639 7634 7638