IR 301-3MK Angle Air Die Grinder Kit Surface Conditioning Kit Ingersoll-Rand has packed the IR301 in a strong, blowmolded plastic case along with four course and four medium grit 3" 3M RolocTM surface conditioning pads and a disc holder. The case can also accommodate: * 2" RolocTM surface conditioning discs. * 2" disc holder in place of three-inch discs. 1 year warranty.