Piston Ring Compressor Set * 2-7/8 to 3-1/8" (73 - 79mm),* 3-1/8 to 3-3/8" (79 - 86mm) * 3-3/8 to 3-5/8" (86 - 92mm) 3-5/8 to 3-7/8" (92 - 98mm) * 3-7/8 to 4-1/8" (98 - 105mm) * 4-1/8 to 4-3/8" (105 - 111mm)