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The Wilwood D52CB caliper is a two-piece, forged-aluminum caliper fitted with a pair of 1.990-inch-diameter stainless steel pistons. Wilwood fits these calipers with bleed valves on both ends of the caliper, so it can be bolted on either side of the car. This way, you can't bolt the caliper upside down with the bleed screw pointing down, which is a common installation error with single-bleeder calipers. On our tour of Wilwood's facility, we saw how the Wilwood logo is engraved with a laser.