Specially designed locking pliers assist in the removal of brake caliper pistons during service or rebuild Simply insert the uniquely shaped extensions on the pliers into the pistons then squeeze the handles on the pliers to lock them into place. Once clamped in place, simply pull the piston out of the caliper For use with 5/8 inch to 2-1/4 inch diameter pistons Durable materials ensure quality performance over the lifetime of the tool