Wilwood stainless steel caliper piston, 1.38 inch by 0.88 inch, offered for caliper rebuilds that call for a stainless piston of this diameter. Stainless construction improves resistance to corrosion in brake systems, and the piston is manufactured to fit applications requiring the specified 0.88-inch dimension.
Wilwood Piston - 1.38in x .88in SS