Skinny rollers are faster and more versatile than brushes for tight areas. The small diameter covers are great for spaces behind toilet tanks, appliances, plumbing fixtures, cabinets, and trimming. Handles are standard threaded for use with extension poles. Foam roller covers are for use on smooth surfaces. Refer to model No. 1770101 (SKU 790788) for 4" foam replacement cover and model No. 1769909 (SKU 790914) for 6" foam replacement cover.