4x twin shower door rollers runners zinc alloy sliders 20mm 23mm diameter wheels<br />!<br /><br />quantity: 4 pcs<br />type: shower door rollers<br />material: plastic， nylon， 304 stainless steel micro-bearing pom abs brass axis - never rust<br />diameter of wheel: 20mm， 23mm <br />width of wheel: 5mm<br />minimum hole size in the glass: 12mm   <br />suitable for glass thickness: 4-8mm<br />swivel action to also fit curved and quadrant showers<br />suitable for most shower enclosures， shower cabins and steam cabin enclosures<br />wear-resistant wheels feature smooth， low-noise sliding<br /><br />note: please check the dimension carelly before purchase!<br /><br />package included: 4 x twin bottom shower door rollers