You can use a hanger, wire, rope or whatever to hold the caliper, but they make the job a little easier and are strong enough that you don't have to worry Wire unfolds when you have your hands full or are away for a moment.
Universal Car Ratcheting Caliper Piston Tool with 2 Steel Plates - Brake Caliper Press (Red, Two Size)
9 Review
π§ Adjustable Engine Cylinder Hone Tool - EWK 1-1/4 to 3-1/2 Inch 3 Stones, Deburring Piston Honer with 220 Grit
9 Review
Wostore Double Flaring Tool Kit with Copper Line Tube Cutter: The Ultimate Solution for Precise Flaring!
35 Review
ABN Brake Drum Tool Kit - 15-Piece Service Brake Kit with Spring Pliers, Brake Spoons, Pad Gauge, Brake Spring Tool
9 Review