3536C - 5mm X 900mm. The Toughlok range of Squire Chains are hardened and offer great value for money. As the chains are lighter than your average chain, they are easily carried around and thus ideal for locking bicycles and motorbikes. The Toughlok chains are also particularly suitable for securing, garden furniture, barbeques, tools, and storage areas.. Durable Sleeve. Square Section. Hardened. Padlock sold separately