Black Slate 20mm / 40mm Our Black 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 Blue Slate 20mm / 40mm Decorative Flat / Angular Fish Friendly Recycled View Product Green Slate 20mm / 40mm Flat/Angular Fish Friendly Recycled Decorative View Product