Material Type: 40mm/M4x10mm | Size: 8 pieces DIYexpert suction cup available in 30mm, 40mm, or 50mm with M4x6mm or M4x10mm thread, including knurled nuts, transparent. Pack contains suction cups and an equal number of knurled nuts. Can be used quickly and universally. Removable without leaving residue. Strong hold due to soft PVC suction cup. Install on smooth surfaces. Clean surface thoroughly before application. Application examples: + Hanging signs of all kinds: office signs, bus signs, advertising posters + In mobile homes: for attaching lightweight objects + In kitchen or bathroom: as a towel holder or for mounting a soap dish in shower enclosures Easy to use, elegant, durable, and innovativethese qualities define DIYexpert brand products. Enjoy the satisfaction of DIY projects and save money with practical solutions.