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3M Scotch-Brite Professional 2-In-1 Rectangle Flat Mop Frame Clips Right Angle What is the difference betweenA part designed for the Scotch Brite Professional 2 in 1 or Standard Rectangle Mop Frame, 18" Aluminum (product no. 20358). A pair of clips secure replaceable 3M hook and loop strips into place at the bottom of the mop frame. A part designed for the Scotch Brite Professional 2 in 1 or Standard Rectangle Mop Frame, 18 inch Aluminum (product no. 20358). A pair of clips secure replaceable 3M hook and loop strips into place at the bottom of the mop frame.