Note: To determine the correct size, you need to measure the outer diameter of the leg. You can use our easy measuring guide for this. Product Information The Round Insert Cap with Movable Ball and Felt is the perfect solution to protect your floor against scratches and damage caused by chair legs. The round shape ensures an elegant appearance and the movable ball ensures that this cap is also suitable for angled legs. This way, the felt surface is optimally utilized. The felt gliding surface offers good gliding properties and prevents scratches on the floor. These insert caps are made of high-quality plastic and the felt gliding surface is very firmly attached using a welding technique. The insert caps are easy to install and fit chair legs with tube diameters from Ø14mm to Ø28mm. Moreover, they are very suitable for angled legs up to a maximum angle of 22 degrees. Does your chair have straight legs? Then the Round Insert Cap with Felt Black is probably a better solution. Size Chart Round Insert Cap with Movable Ball and Felt Outer Diameter (mm) Inner Diameter (mm) 14 8,4 – 11,4 16 12 – 13 18 14 – 15 19 15 – 16 20 16 – 17 22 18 – 19 25 21 – 22 28 24 – 25 Material: Gliding surface – Felt (medium-hard), Plastic parts – PS (Polystyrene) Color: Felt – grey, Plastic parts – black