Vitrex 10 2041 Floor Tile Spacers. Size: 4mm. Quantity: 250. Vitrex Floor Tile spacers provide an easy way to achieve a more professional finish, spaces floor tiles evenly, and ensures an even grout line throughout. Supplied in a resealable bag or tub for easy and convenient storage. Each pack comes complete with a Ready Reckoner, a quick and simple way to calculate the correct number of spacers required.