Profile: Polymers Developments Roto Moulding is a provider of rotational moulding services. Our products include waste bins & recycling containers, garden pots & planters, plastic tubs & buckets, storage containers, hanging baskets, mini grit bins, water tanks, gill net bins and fuel tanks. Our miniature grit bins are ideal for storing grit for use on icy paths, driveways, entrances and private land. It has features like moulded handles for easy mobility, safe & durable construction, supplied with & without grit, comes with 2 scoops and water tight.