Zinc alloy double shower door roller wheel runner/pulleys/rollers/wheels bearing diameter 20mm/23mm/25mm/27mm Features: Set of 2pcs double shower door rollers One lot=1pcs upper part rollers + 1pcs lower part rollers Nylon roller thickness 6mm.Inner diameter 5mm.According to diameter of nylon roller, there are 20mm,23mm,25mm,27mm. Glass thickness:4-5mm;Glass Mounting hole diameter:10-12mm Specifications: Main Material:Nylon roller, 304 stainless steel shaft and screw Color:Gray&White Direction:Swing Mainly usded in bathroon shower room shower enclosure show door pulley. Kindly/Warm Tip : 1.Please be reminded that due lighting effects, monitor's brightness/contrast settings etc, there could be some slight differences in the colour tone of the website's photo and the actual item. 2. Item Measure by hand, it could be 1cm different,your kind understanding will be much appreciated. Package Include: 1set(1Pc upper&1Pc Lower part rollers) The merchant warrants that their products comply with all applicable laws, and are offered only if they comply with Joom's policies and EU Product Safety and Compliance laws.