Simply slides in and holds the pistons under "spring" tension.
Don't use blocks of wood or screwdrivers and levers to push the pistons back after they've moved forward, buy a pair of these clamps......very handy!
Features:
Suits most car and truck drum brakes. Self-Adjusts to apply pressure and immobilize brake piston. Range 1-1/8" to 3-1/4". Large size - cannot be left inside brake drum.
