Unger Professional LockOn Stiff Non-Scratch Swivel Grout BrushStiff, non scratch bristles for grout and corner cleaning. Use on pole. Use LockOn poles with LockOn attachments for anti rotate connection. Matching blue threads click in place for a secure, no spin connection. Attachment won't come off pole until you press both buttons to release. Poles and attachments work with all universal threaded attachments and poles. %search_data%975200