3" (75mm) diameter with three mounting screw holes

Sleev Pepk 6" W

or floor to ceiling mounted pilasters

square-shaped end cap with sides of 1-1/4 inches in length

which have rough openings that measure 15-5/8 inches in width by 11-1/4 inches in height by 4 inches in depth

ASI 74022-SSM Toilet Tissue Holder - Double - Satin Stainless Steel - Surface Mounted (ASI 39 Dry Wall Clamp & ASI R-009 Theft Resistant Spindles Not Included - Please Order Separately as Needed) Nominal Size-12" X 1.5" 3" (75mm) diameter with threeASI 74022 SSM Toilet Tissue Holder Double Satin Stainless Steel Surface Mounted (ASI 39 Dry Wall Clamp & ASI R 009 Theft Resistant Spindles Not Included Please Order Separately as Needed)