24000 Lisle Piston Ring Groove Cleaner 2-3/4" to 5" Diameter Heavy coil spring holds cutter in groove for fast removal of carbon. Tool comes with standard 24020 cutter blade sizes: 5/64" in., 3/32" in., 1/8" in., 5/32" in., 3/16" in. and special 24350 cutter blade with sizes: 1.5mm, 1/16" in., 1.75mm, 2mm, and 1/4"". Handles pistons 2 3/4" in. to 5" in. diameter. 24270 metric cutter wheel is available with 2mm, 2.5mm, 3mm, 4mm and 5mm.