AIR ANGLE DIE GRINDER KIT REAR 6MMCOLLETEXHAUST 10 STONES. DEBURRING, POLISHING,GRINDING AND BREAKING WELDS NITTOThe Angle Air Die Grinder Kit features a 1/4 inch collet and includes 10 stones for deburring, polishing, grinding, and breaking welds. The kit is designed for rear exhaust use with a 6mm collet size.