Most of these drill brush attachments use a 1/4" mounting shaft, designed to fit cordless drills that accept 1/4" shaft accessories.
Many sets include tapered or pointed heads for tight grout lines and corners, plus flat heads for larger flat surfaces like floors, countertops, and tubs.
Common sizes include roughly 2" (small), 3.5" (medium), and 4" (large) brush heads; individual listings usually list exact dimensions.
Bristles are typically polypropylene (PP) or nylon/PP blends, while the shafts are usually steel, often with nickel plating or heat treatment for added durability.
Quick-change and mounting shafts let you swap brush heads quickly and easily, speeding transitions between different cleaning tasks.