Blue Slate 20mm / 40mm Blue Slate Chippings (picture is wet) Delivery Description Sized in either 20 or 40mm these can be delivered in loose loads (up to 29 tonne), bulk bags (approx. 875kg) and small 20kg bags directly to site on our FORS Gold fleet. Other Products View Allicon-button-arrow-green Purple / Plum Slate 20mm / 40mm Fish Friendly Decorative Flat / Angular Recycled View Product Black Slate 20mm / 40mm Decorative Fish Friendly Recycled Flat / Angular View Product Green Slate 20mm / 40mm Flat/Angular Fish Friendly Recycled Decorative View Product