Vitrex 10 2251 Wall Tile Spacers 2.5 mm. Pack Of 250: Vitrex wall tile spacers are supplied in a resealable bag or tub for easy & convenient storage. Each pack comes complete with a Ready Reckoner a quick & simple way to calculate the correct number of spacers required. Tile spacers provide an easy way to achieve a more professional finish, space wall tiles evenly, & ensure an even grout line throughout. Size. 2.5 mm. Qty. 250.