TBC Mixer B3 Heavy Duty Professional Mixer for Epoxy, Paint, Mud, Grout, Thin Set, Plaster, Cement Topping, Dry Wall etc 20" Unique Configuration, Mighty Red Sized for a 3/8-1/2" chuck, it is a six sided bit end for standard drills Heavy duty & made to last Power coated red for durability & dependability Won't rust This bit will mix the toughest and grittiest mixes