Extra large clugs are designed for the larger and heavier bikes. the clug is made of plastic and very sturdy. put it on the wall with the screws and wall plugs that are included and your bike will take up less space. please note that it is only for brick walls and wooden beams. features- world's smallest bike rack- space-saving- attach only in brick walls and wooden beams- not suitable for fixing to plasterboard walls!- Includes screws and wall plugs- does not damage your bike- does not damage the wall- fits big fat mountain bike tyres between 70 - 81 mm (2.75 - 3.2”)product information - product: clug plus bike clip wall mounted rack - white/black- material: plastic- dimensions: l 9.5 x w 9.5 x h 5.5 cm- weight: 120 grams- colour: white, black - packaging: gift packaging- packaging dimensions: l 21.5 x w 10 x h 6.5 cm- packaging weight: 180 grams- brand: clug