Use with a standard rotary floor machine for intensive carpet maintenance. Standard thickness, original blend (P1 Series) bonnets work well with either shampoo or solvent based chemicals. Use with a 175 RPM floor machine. The low-profile (P3 Series) bonnet provides improved operator control on rotary floor machines from 175-300 RPM. The low-profile bonnet with scrub strips (P4 Series) adds additional scrubbing action for improved cleaning performance. 17" diameter.