Hello and Welcome For Sale : New & Genuine item. Diameter: 85mm. ACZ 85 RD4 Up to 10 x applications with 1 blade. Save time and money with a multi-function accessory. Starlock mount for maximum power transfer and convenient blade change within 3 seconds. Ideal for removing damaged tiles: the 3 max can cut out mortar joints - including corner pieces - and also sand off the mortar behind the old tile after it has been removed. Best for tilers: extremely versatile and efficient. Any questions, please message. Returns accepted.