Size: 13mm 16mm 19mm 20mm 22mm 25mm 28mm 30mm 32mm 35mm 38mm 40mm 42mm 45mm 48mm 50mm 60mm 63mm 76mm. The product is made of high quality plastic, non-slip and wear-resistant, not easy to fall off, easy to install, high enough to make the tube set more solid.
eBay