This listing is for a set of six (6) Standard Bore Size 3.875"bore size hyper eutectic, coated skirt pistons and matching cast steel ring set compatible replacements for 1996-2006 Jeep models with the 4.0L 6-cylinder engine. Piston specifications are as follows: HEAD TYPE: Recessed head .116" deep RING LANDS: 1.50mm-1.50mm-4.00mm COMP. DISTANCE: 1.592" PIN DIAMETER: .931"