Walter 07-R 452 Surface Conditioning Disc 4-1/2" Coarse (Box of 10) Walter Surface Technologies Sale! from 7250 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Surface Conditioning Disc, 4-1/2" Dia, Coarse Grade, Quick-Step Blendex SKU:WLT 07R452